And you apparently don't know dates or history. FDR became president in 1932, after the Depression started. His presidency saw unemploment decline steadily- until they tried to stop spending and balance the budget. Then it rose again until WWII ended that nonsense. Austerity fails again.
Wilson was president until 1920- 9 years before the collapse. He may have contributed, but not as much as the guys in charge of the next decade did. Hoover only became president in 1929- the year of the collapse. He made things worse by not doing any of the things needed to help, but by that time it was pretty inevitable and we didn't understand economics the way we do now. He gets too much of the blame though.
If you're going to blame the president the real blame goes to Coolidge, who was actually president for the 7 or 8 years prior to the depression (I believe 21-28, but it could have been 22, I forget when Harding died).
And he's right on Reagan if you go by the stock market. The last stock market crash before 2008 was in 1987. We also went into a recession not too long afterwards, although it wasn't as bad as the most recent by a long shot. I don't have numbers offhand to check if it was or wasn't worse than Y2K.