According to the 25th Amendment to the Constitution (1967), If a vice president resigns or he cannot continue in charge, the then President has to select a new candidate to cover the vacancy. The nominee must be approved by the House of Representatives and the Senate by majority.
The African culture was matrilineal, had an elaborate system of social rank and that worshipped many gods. The Africans were already engaged in slavery because they responded to the demand form wealthy families in the Mediterranean who wanted black men and women as domestic servants. They provided slaves for labour shortage in Europe. Slavery began to increase because of sugar cultivation.
Yom Kippur war - 2
Six day war - 3
Persian gulf war - 1