What is the meaning of Montesquieu's idea of checks and balances

This Monetesquieu's idea is of great importance because it greatly influenced the organization of power in the United States as its government system is based on checks and balances. The purpose of checks and balances means the division of power and that each branch of the government controls.

president franklin roosevelt supported the tva as part of his first new deal measures approved by congress in 1933. this new agency was designed to control floods, produce electric power, and improve the lives of people living in the tennessee valley. the tva accomplished many of these goals despite problems.

i think it was   tsar alexander ii