Why did the founding fathers feel that a system of checks and balances was necessary in our federal government?

They thought it was necessary because they had to check and make sure each branch doesn't go over their limit of power. I hope that answers your question.

Explanation:

I hope this chart helps

Your pfp looks like that girl from ice age where she is that grandma and dreams of herself as a blonde with with her young self sitting on a rock and her hair is flowing around her and I think this is when she gets trapped in the thoughts when they get attacked by those weird fish that make your see things that aren’t real. My point is that you remind me of an animal in ice age :)