Which of the following best analyzes a major pattern in nationalist movements in Africa after 1945?

There were increased calls for Black African unity and liberation through the congress model.

Overall desire to exclude the working and lower classes in postcolonial Africa emerged.

Overall desire to implement socialism decreased as capitalist movements became more popular.

Experimental political blocs such as the United Arab Republic became popular.

The best analysis is: There were increased calls for Black African unity and liberation through the congress model.

This is because after 1945, nationalist movements in Africa focused on advocating for African unity and liberation from colonial rule through the establishment of organizations such as the Pan-African Congresses. The congress model was used as a platform to bring together various African leaders and activists to push for independence and self-determination for African nations. This emphasis on unity and liberation was a major pattern in nationalist movements in Africa during this time period.