When did African Americans join the Republican Party? Actually before and after reconstruction. During the civil rights era of the 1960’s it’s recorded that Dr. Martin Luther King, Jr fought against democrats who stood in the schoolhouse doors, turned fire/water hoses on blacks and let loose vicious dogs. http://images.nbra.info/docs/library/NationalBlackRepublicanAssociation2009/Democrats%20Smeared%20MLK%20in%20the%201960’s.pdf
Some notable republicans:
Condoleeza Rice-First Africian American Women Secretary of State
Colin Powell-4-Star General and 1st African American Secretary of State
Booker T. Washington–educator and activist
Ida Wells-Civil Rights Advocate and Co-Founder of the NAACP
Harriet Tubman-Abolitionist and Speaker
Frederick Douglas-Abolitionist, Author and Statesman
Here is more American History www.nbra.info/index.cfm