One of Baron de Montesquieu's key ideas was?

Hello!

One of Montesquieu's key ideas was separation of powers. His ideas influenced how the U. S. government is run today. He believed that if a government were to be separated into different branches, they would be able to balance each other out (this is known as checks and balances), which would prevent one branch from becoming too powerful.

I hope this answers your question! Have a great day!

Was : creating checks and balances