Answer:
1. Tribes in the southwestern forest unite to form the Yoruba Kingdom.
2. Nigeria's southern coast is known as the Slave Coast because of the extensive slave trade.
3. The British fight wars against the Yorubas, Benins, and other tribes.
4. Journalist Nnamdi Azikiwe is named governor-general and later becomes Nigeria's first president.
5. Nigerians adopt a new constitution and elect civilian President Olusegun Obasanjo.
Step-by-step explanation:
The Yoruba Empire under Oyo was formed in the 17th century but before that the Yoruba had existed for a long time and occupied the surrounding area. After the arrival of the Europeans, extensive slave trading happened in the southern coast of Nigeria and till this day a significant portion of the African American population in the U.S. can trace their origin to that area.
The British then began to exert control in Nigeria in the 19th century and came into conflict with the Yoruba and Benin who they eventually defeated and eventually added to Northern and Eastern parts of Nigeria to form a colony.
This colony gained independence in 1960 as the Republic of Nigeria with Nnamdi Azikiwe as the first President.
The country then experienced two military coups, a civil war and then two more military coups until 1999 when Olusegun Obasanjo became President of a new democratic Nigeria.