Answer:
First is federalism. I'll put definitions of the others below if it helps cuz I can't say for sure.
Because it encouraged later revolutions in other parts of the world. :)
Disabled
Because the President is not able to fulfill his duty, so the Vice President must take over. The Vice President takes over the “powers and duties” of the presidency in the event of the president’s removal, death, resignation, or inability
The Russian people lost a lot of soldiers