Also, I believe Teddy is the one who drove Blacks out of the Republican Party and into the Rat party.
Under Teddy, there was a Black Army unit that was framed in Brownsville Texas and Teddy completely messed up the investigation alienating blacks in general from Republicans and we have never gotten back that voter block.
No, Roosevelt had a lot of bad effects but the Black vote went solidly democratic as a result of the New Deal. Until then they were not closely aligned. After FDR, Eisenhower was successful in capturing a large Black vote, around 20% in 1952 and 40% in 1956.
Blacks again turned to the rat party in 1964 because they were convinced that Goldwater's states' rights principles were a cover for segregation and other racist policies. It was not true, at least as far as Goldwater was concerned, but the media sold them on it.
TR did alienate Blacks, though. Both with the Brownsville incident and with his plan to build his new Progressive Party in the South based on a segregated White organization.
African-American intellectuals like DuBois and Trotter turned to Woodrow Wilson instead. Dumb move. Wilson was a segregationist himself, as TR -- the man who invited Booker T. Washington to the White House -- never really was.