Why does China think that they own Taiwan? Is Taiwan not a seperate country?
China claims sovereignty over Taiwan based on the One-China Policy, which states that there is only one Chinese government and that all of China's citizens are members of this government. This policy was established in 1978 and has been upheld by both the Chinese Communist Party (CCP) and the Republic of China (ROC) governments since then.

However, many countries around the world recognize Taiwan as an independent nation with its own unique culture, language, and political system. The United States, for example, has long recognized Taiwan as a separate country and has maintained close economic, military, and diplomatic relations with it. Other nations such as Japan, South Korea, and Australia also have official relationships with Taiwan.

Taiwan's relationship with mainland China is complex and multifaceted. On the one hand, Taiwan is home to a large population of people who support independence from China and want to maintain their cultural and linguistic identity. On the other hand, Beijing views Taiwan as a renegade province and has made numerous attempts to annex or control it.

The status of Taiwan remains a source of tension between China and the rest of the world, and the issue continues to be a major concern for international diplomacy and security.