Who here knows a lot about Washington, Jackson, or Lincoln? If you're able to help me, I'll give you LGG.

I need to know about each of the three:
A) why they were important
B) what problems they faced
C) how they shaped the modern presidency

Only counts if it's something I don't already have (which I don't feel like posting, 'cause it's long, and not like anyone's gonna read it all anyway). Thanks and stuff. I guess I'll give 1k LGG for each fact that someone states that I don't already have. Maybe more, if it's good.