What major differences are there between the power of the Presidency today and how it was intended?

Part 1) What major differences are there between the power of the Presidency today and how it was intended? Why did it change so much from what they intended? Has the Presidency made Congress and the Courts largely irrelevant today? Part 2) Research the President I assign you below and tell me about him, his accomplishments, drawbacks, years in office, significant points in his presidency, etc. [DO NOT just read wikipedia, do real research, what events did they have to endure, etc.] I’m looking for you to get in their heads; what was the context of their administration? What challenges did they have? accomplishments? etc. Use full detail. The president you will search is Jimmy Carter.