Why do African Americans vote overwhelmingly for the democratic party?

I have seen no legislation aimed at helping them for the past 30 years from the Liberals. African Americans are a very religious people yet support the party that is aginst religion. So why in every election do more than 90% of them vote for the Democrats?
Update: A lot of answers saying that the Republicans are the party of the rich while the Democrats are the party of the Poor. Since this inequality in voteing has been happening since the early 1900's isn;t that reason to leave the Democrats? Useing the rich man, poor mans party the Democrats have kept afican americans... show more A lot of answers saying that the Republicans are the party of the rich while the Democrats are the party of the Poor. Since this inequality in voteing has been happening since the early 1900's isn;t that reason to leave the Democrats? Useing the rich man, poor mans party the Democrats have kept afican americans in poverty for close to 50 years.
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