Buddhism in Southeast Asia includes a variety of traditions of Buddhism including two main traditions: Mahāyāna Buddhism and Theravāda Buddhism. Historically, Mahāyāna had a prominent position in the region, but in modern times, most countries follow the Theravāda tradition. Southeast Asian countries with a Theravāda Buddhist majority are Thailand, Cambodia, Laos, Myanmar, all of them mainland countries.
Vietnam continues to have a Mahāyān majority due to Chinese influence. Indonesia was Theravāda Buddhist since the time of the Sailendra and Srivijaya empires, but Mahāyāna Buddhism in Indonesia is now largely practiced by the Chinese diaspora, as in Singapore and Malaysia. Mahāyāna Buddhism is the predominant religion of Chinese communities in Singapore, Malaysia, Brunei, and Indonesia.
History.
Early traditions and origins.
Buddhism reached Southeast Asia both directly over sea from India and indirectly from Central Asia and China in a process that spanned most of the first millennium CE.
In the third century B.C., there was disagreement among Ceylonese monks about the differences in practices between some councils of Bhikkhu monks and Vajjian Monks. The Bhikkhu monks affirmed Theravada traditions and rejected some of the practices of the Vajjian monks. It is thought that this sparked the split between Theravada and Mahayana Buddhism.
Theravada Buddhism was formed and developed by Ceylon Bhikkhus during a period spanning from the third century B.C. to fifth century A.D. Ceylonese influence, however, did not reach Southeast Asia until the eleventh century A.D. Theravada Buddhism developed in Southern India and then traveled through Sri Lanka, Burma, and into Thailand, Cambodia, Laos and Beyond.
In the twelfth century, Mahayana Buddhism developed in Northern India and traveled through Tibet, China and into Vietnam, Indonesia and beyond.
Buddhism is thought to have entered Southeast Asia from trade with India, China and Sri Lanka during the 1st, 2nd and 3rd centuries. One of the earliest accounts of Buddhism in Southeast Asia was of a Theravada Buddhist mission sent by the Indian emperor Ashoka to modern-day Burma in 250 BCE. The mission was received by the Mon kingdom and many people were converted to Buddhism. Via this early encounter with Buddhism, as well as others due to the continuous regional trade between Southeast Asia, China and South Asia, Buddhism spread throughout Southeast Asia. After the initial arrival in modern-day Burma, Buddhism spread throughout mainland Southeast Asia and into the islands of modern-day Malaysia and Indonesia. There are two primary forms of Buddhism found in Southeast Asia, Theravada and Mahayana. Theravada Buddhism spread from India to Sri Lanka then into the region as outlined above, and primarily took hold in the modern states of Burma, Cambodia, Laos, Thailand and southern Vietnam. Mahayana Buddhism is thought to have spread from both China and India during the first and second century into Southeast Asia. Mahayana took root primarily in maritime Southeast Asia, although there was also a strong influence in Vietnam, in part due to their connection with China.
Srivijaya, Java and the Khmer Empire.
During the 5th to 13th centuries, The Southeast Asian empires were influenced directly from India, so that these empires essentially followed the Mahāyāna tradition. The Srivijaya Empire to the south and the Khmer Empire to the north competed for influence, and their art expressed the rich Mahāyāna pantheon of .
Srivijaya, a maritime empire centred at Palembang on the island of Sumatra in Indonesia, adopted Mahāyāna and Vajrayāna Buddhism under a line of rulers named the Sailendras. Yijing described Palembang as a great centre of Buddhist learning where the emperor supported over a thousand monks at his court. Yijing also testified to the importance of Buddhism as early as the year 671 and advised future Chinese pilgrims to spend a year or two in Palembang. Srivijaya declined due to conflicts with the Chola rulers of India, before being destabilised by the Islamic expansion from the 13th century.
Between 8th to 11th century, Medang Mataram kingdom flourished in Central Java ruled by Sailendra dynasty, which also the ruling family of Srivijaya. The reign of King Panangkaran (r. 760—780) saw the rise of Buddhist Mahayana influence in central Java, as the Sailendran kings became the ardent patron of Buddhism. Numerous Buddhist temples and monuments were erected in the region. Notable example includes Kalasan, Manjusrigrha, Plaosan, and the grand stone mandala Borobudur, completed during the reign of Samaratungga (r. 819–838) in early 9th century. The period marked the apogee of Buddhist civilization in Indonesia. 
From the 9th to the 13th centuries, the Mahāyāna Buddhist and Hindu Khmer Empire dominated much of the Southeast Asian peninsula. Under the Khmer, more than 900 temples were built in Cambodia and in neighbouring Thailand. Angkor was at the centre of this development, with a temple complex and urban organisation able to support around one million urban dwellers.
Early spread of Theravada Buddhism.
There are many factors that contributed to the early spread of Theravada Buddhism throughout Southeast Asia. The main three ways in which the religion was transported into the region is through systems of trade, marriage, and missionary work. Buddhism has always been a missionary religion and Theravada Buddhism was able to spread due to the work and travel of missionaries. The Mon people are an ethnic group from Burma (Myanmar) that contributed to the success of Theravada Buddhism within Indochina. Buddhism was likely introduced to the Mon people during the rule of Ashoka Maurya, the third emperor of the Mauryan Dynasty (268-232 BCE) in India. Ashoka ruled his kingdom in accordance with Buddhist law and throughout his reign he dispatched court ambassadors and missionaries to bring the teachings of the Buddha to the east and Macedonia, as well to parts of Southeast Asia. India had trading routes that ran through Cambodia, allowing for the spread of these ideologies to easily occur. The Mons are one of the earliest ethnic groups from Southeast Asia and as the region shifted and grew, new inhabitants to Burma adopted the Mon people's culture, script, and religion.
The middle of the 11th century saw a decline of Buddhism in Southeast Asia. From the 11th to 13th century the Khmer Empire dominated the Southeast Asian peninsula. Hinduism was the primary religion of the Khmer Empire, with a smaller portion of people also adhering to Mahayana Buddhism. During the Khmer Rule, Theravada Buddhism was only found in parts of Malaysia, northwest Thailand, and lower Burma. Theravada Buddhism experienced a revival under the rule of Anawrahta Minsaw (1014–1077 AD). Anawrahta was the ruler of the Pagan Empire in Burma and is considered to be the founder of the modern Burmese nation. Anawrahta embraced and revived the Mon people's form of Theravada Buddhism through his building of schools and monasteries that taught and supported Theravada ideologies. The success of Theravada Buddhism in Burma under the rule of Anawrahta allowed for the later revival and growth of Buddhism in neighboring Southeast Asian countries, such as Thailand, Laos, and Cambodia. The influences of the Mon people as well as the Pagan Empire are still felt today throughout the region. Currently, the Southeast Asian countries with the highest amounts of practicing Theravada Buddhists are Myanmar, Thailand, Laos, and Cambodia.
Political power and resistance.
Buddhism has long been characterized by some scholars as an other-worldly religion, that is not rooted in economic and political activity. That is in part due to the influence of German sociologist, Max Weber, who was a prominent scholar of religion that has had a significant impact on the way Southeast Asian Buddhism is studied. Many contemporary scholars of Buddhism in Southeast Buddhism are starting to move away from the Weberian school of thought and identifying the role Buddhism has played in economic, political and every-day life in the region. Buddhism has also played a role in the consolidation of power and political resistance to throughout history, dating back to as early as the 10th and 11th century. Buddhist resistance has been a part of many significant historical moments, from the resistance to colonization and colonial powers, the creation of nation-states and the consolidation of political power within kingdoms and states.
Some of the earliest accounts of religious conflict that trace back to the 11th century took place in modern-day Burma. There was tension between Buddhist kings looking to create a more uniform religion and different sects of Buddhist worship. In particular, there was resistance from the cult of Nat worship, a religious practice that predates Buddhism in Burma. Buddhist kings of the time attempted to unify the different sects of Buddhism by the elimination of heretical movements. This was done so in order to maintain their power over their people and in an effort to purify the faith.
During the Nguyen dynasty of Vietnam in the 19th and 20th century, there was a strain between Confucian rulers and practitioners of Buddhism monks during the early unification of the empire. The rulers had a fear of potential rebellions emerging from monastic sites in the countryside and heavily criticized the spiritual practices of Buddhist sects, including a belief in invulnerability based on merit. After an attempt to de-legitimize Buddhist faith in the eyes of Vietnamese people through this criticism of their practices, they declared a war on Buddhism to squash any resistance to the consolidation of their empire
During the late 19th century and early 20th century, there were Buddhist resistance movements in the kingdom of Siam. These resistance movements were led by holy men or phu mi bun who had great power due to a high accumulation of merit. Some of these men claimed to have powers of invulnerability to enemy bullets and shared their powers through bathing others in holy water. An early phu mi bun rebellion was led by a former Buddhist monk, Phaya Phap, who resisted increased taxes in the province of Chiang Mai and proclaimed he would be the new, ideal Buddhist king of the region. These movements were not associated with mainstream Buddhism of the time, but many of the leaders had been ordained monks and utilized some Buddhist symbolism and philosophies.
Buddhist resistance also played a role in anti-colonialism movements. During the British colonization of Burma in the 19th century, there was intense Buddhist militarization and resistance against the colonial occupiers in an effort to restore the ideal Buddhist monarchy. There have also been more recent Buddhist resistance movements in Southeast Asia. After the communist takeover of Laos in 1975, some Buddhist monks feared that Buddhism was threatened by the Pathet Lao government. Many monks fled from Laos to Thailand and helped fund resistance movements from across the border. Monks who stayed in Laos supported resistance fighters with food and medical supplies. Another act of Buddhist resistance took place in Saigon in 1963 when a Mahayana Buddhist monk, Thích Quảng Đức, self-immolated in the middle of a busy intersection. This self-immolation was an act of protest of the regime of South Vietnamese President Ngo Dinh Diem, a member of the Catholic minority who ruthlessly persecuted and suppressed the Buddhist community.
Theravada traditions.
Theravada Buddhism in Southeast Asia is rooted in Sri Lankan Buddhism that traveled from Sri Lanka to Burma and later to lower Thailand.
The Buddha, the Dhamma, and the Sangha are the three fundamental aspects of Theravāda Buddhist thought. The Buddha is the teacher of gods and men. The Dhamma consists of the teachings of the Buddha. It is the Noble Path made through the words and deeds of the Buddha that is to be followed. The path leads the follower from the Realm of Desire, to the Realm of Form, the Formless Realm with the ultimate destination being Nibbāna. The Sangha (gathering) refers to the two types of followers of the Buddha: laity and monastic. The monastic members strictly adhere to the Buddhist monastic discipline, known as the Vinaya. Theravadin Bhikkhu lead a very disciplined life modeled after the Buddha, going from Pabbajjā or novice ordination (sāmaṇera) to Upasampada or higher ordination (Bhikkhu).
The Thai Sangha has led various Theravada Buddhist missionary works in Southeast Asia, South Asia, Europe, and North America, where most delegations focused on the United States, rather than Asian countries with dwindling Theravada Buddhist populations such as the Philippines, Indonesia, Timor-Leste, Brunei, and eastern Malaysia.
Mahāyāna traditions.
Mahāyāna Buddhism in SE Asia is rooted in Buddhist traditions that traveled from Northern India through Tibet and China and eventually made their way to Vietnam, Indonesia and other parts of southeast Asia.
Mahāyāna Buddhism consists of a large variety of different sūtras. A defining feature of Mahāyāna Buddhism is