By the end of the reconstruction era, most african-americans in the united

D)found themselves increasingly left out of the political process because of poll taxes and literacy tests.

Explanation:

While the 13th, 14th, and 15th Amendments were intended to ensure African-Americans equal rights, such was not the case. Many states in the south found way around these Constitutional provisions, and many African Americans found themselves increasingly left out of the political process because of poll taxes and literacy tests.

a.

congress passed laws allowing for free passage between states.