To ensure continuing influence, the British promoted unity in the Northern bloc and discord among and within the two Southern regions. The government following independence promotes discord in the West with the creation of a new Mid-Western Region in an area with oil potential. The new constitution of 1946 also proclaimed that "The entire property in and control of all mineral oils, in, under, or upon any lands, in Nigeria, and of all rivers, streams, and watercourses throughout Nigeria, is and shall be vested in, the Crown." Britain profited significantly from a fivefold rise in Nigerian exports amidst the postwar economic boom. Nigeria gained independence on 1 October 1960. The First Republic came into being on 1 October 1963. The first prime minister of Nigeria, Abubakar Tafawa Balewa, was a northerner and co-founder of the Northern People's Congress. He formed an alliance with the National Council of Nigeria and the Cameroons party, and its popular nationalist leader Nnamdi "Zik" Azikiwe, who became Governor General and then President. The Yoruba-aligned Action Group, the third major party, played the opposition role. Workers became increasingly aggrieved by low wages and bad conditions, especially when they compared their lot to the lifestyles of politicians in Lagos. Most wage earners lived in the Lagos area, and many lived in overcrowded dangerous housing. Labour activity including strikes intensified in 1963, culminating in a nationwide general strike in June 1964. Strikers disobeyed an ultimatum to return to work and at one point were dispersed by riot police. Eventually, they did win wage increases. The strike included people from all ethnic groups. Retired Brigadier General H. M. Njoku later wrote that the general strike heavily exacerbated tensions between the Army and ordinary civilians, and put pressure on the Army to take action against a government which was widely perceived as corrupt. The 1964 elections, which involved heavy campaigning all year, brought ethnic and regional divisions into focus. Resentment of politicians ran high and many campaigners feared for their safety while touring the country. The Army repeatedly deployed to Tiv Division, killing hundreds and arresting thousands of Tiv people agitating for self-determination. Widespread reports of fraud tarnished the election's legitimacy. Westerners especially resented the political domination of the Northern People's Congress, many of whose candidates ran unopposed in the election. Violence spread throughout the country and some began to flee the North and West, some to Dahomey.