These events are part of republican history and are major reasons blacks left the party.
1876 US ELECTION: The Corrupt Bargain -- Republicans (Hayes) made a back room deal with the Democrats to gain control of the Presidency
The period after the Civil War, 1865 - 1877, was called the Reconstruction period. Abraham Lincoln started planning for the reconstruction of the South during the Civil War as Union soldiers occupied huge areas of the South.
The Compromise of 1876 and the removal of federal troops from the South by order of President Rutherford B. Hayes on May 1, 1877 ended Reconstruction. Reconstruction was the time between 1865 and 1877 when the federal government set the laws in which the southern states were allowed to be readmitted back into the United States. All former Confederate states were admitted back into the country by 1870.
FACT: The Republicans (Hayes) sold out African Americans in the South to gain power of the White House.
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I am a republicans and it is true that I think that the vast majority of blacks do not know the particulars of that political deal.
However, I think the vast majority of blacks have a general understanding that, in the past, a lot of shady political deals of all kinds were done, and that quite often they got fucked.
The blacks did started switching parties during FDR's New Deal. Social Programs to help the poor and unemployed were to much of a draw, they had to support them even though they knew the dems were the party of racism.
So, your point is wrong.