Why Did the number of African-Americans Who who participated in politics through voting and running for political office is almost completely disappear when the reconstruction era ended?

Because the African Americans who did show up to vote were told by white basically henchmen that their time to vote passed or that they were at the wrong polling venue and more or less basically the law may say u can vote but us backwards thinking white men say no so voting diminished because what's the point of showing up to vote just to be strong armed