why is it important for the president to share powers with congress
Powers of the President of the United States The Separation of Powers devised by the founding fathers was designed to do one primary thing: to prevent the majority from ruling with an iron fist. Based on their experience, the framers shied away from giving any branch of the new government too much power. The separation of powers provides a system of shared power known as "checks and balances". For example, the President appoints judges and departmental secretaries, but these appointments must be approved by the Senate. The president can veto bills, or deny them. If he does that, the bill is sent back to Congress.
Powers of the President of the United States Though constrained by various other laws passed by Congress, the president's executive branch conducts most foreign policy, and their power to order and direct troops as commander-in-chief is quite significant (the exact limits of what a president's military powers without Congressional authorization are open to debate).