Okay, well there is many reasons but rome wanted to have multiple people to rule not just 1 or 2.... Monarchy never works so thats why in 509 BC Rome switched into a republic. Then they switched back in 27 BC to dictatorship....
The three branches of the government are the Executive, Legislative, and the Judicial branch. https://www.google.com/search?q=three+branches+of+government&rlz=1CAHPZQ_enUS786US786&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi5v5jGr7HdAhVJTd8KHY9RCS8Q_AUICigB&biw=1536&bih=720#
The Constitution explicitly assigns the president the power to sign or veto legislation, command the armed forces, ask for the written opinion of their Cabinet, convene or adjourn Congress, grant reprieves and pardons, and receive ambassadors. The president shall take care that the laws are faithfully executed and the president has the power to appoint and remove executive officers. The president may make treaties, which need to be ratified by two-thirds of the Senate, and is accorded those foreign-affairs functions not otherwise granted to Congress or shared with the Senate. Thus, the president can control the formation and communication of foreign policy and can direct the nation's diplomatic corp
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