Which civil rights tactic was most directly responsible for African Americans gaining equal access to the ballot box especially in southern states during the 20th century

Non-violent protest--blacks participating in the marches and non-violent protests eventually gained attention and led to the Voting Act and Civil Rights Act. 

As blacks continued non-violent protest but were met with violence the media exposed the actions revealing to the whole country. LBJ could not longer ignore the concerns of blacks in the country and encouraged the passing of the Voting Rights Act (1965) and the Civil Rights Act (1964). 

Explanation:

Mass protest pressuring members of congress to pass new laws

Explanation:

answer: born in saint-dié, in the vosges department, france, he studied law, and was called to the bar at paris in 1854,[2] but soon went into politics, contributing to various newspapers, particularly to le temps. he attacked the second french empire with great violence, directing his opposition especially against baron haussmann, prefect of the seine department. a series of his articles in le temps was later republished as the fantastic tales of haussmannlaxupa (1868).[2]

explanation:

he is known for discovering   the fossil of a female hominin australopithecine   known as "lucy" in the afar triangle region of hadar, ethiopia.

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