Who was the first u. s. president to preside over all 50 states?

 Dwight D. Eisenhower 

Explanation:

George Washington was the first president. yes. but not to all 50 states.

du boi was considered a radical because he wanted the immediate end for segregation. the biggest different between him and booker t. washington is that, even though washington believed that segregation should be considered illegal, he did not believe at all that a law was needed to keep blacks away from whites and that this would be something natural (to have the races apart) for a long time until society adjusted, while du boi believe that agitation was the only way to end segregation.