Why did african american political participation rise and then suddenly decrease

Because of disenfranchisement

Explanation:

During the Reconstruction Era, African American gained the right to freedom and also the right to participate in politics, by voting or by being candidates. But after Reconstruction Era ended a series of laws and practices were created in the Southern States that were used to prevent African Americans from participating in politics or even voting, this process is called disenfranchisement. Some laws required literacy tests, others included poll taxes.

the church governed the society after the empire fell.   constantine took charge of rome and ended the confusion which had over religion and made christianity as the only religion and that started ruling the roman empire. he also divided the empire into two and fortified the eastern part.   he ruled the eastern part.