What are the three parts of the executive branch?
what were the constitutional changes to the presidency?

The three branches are Executive, Legislative, and judicial.

Explanation:

The Executive Branch establishes the role of the president. The President of The United States is the head of this branch. He works with his cabinet members

The Legislative Branch establishes Congress. It is in charge of initiative, passing, and establishing laws.

The Judicial Branch  includes criminal and civil courts and helps interpret the United States Constitution. The most important part of the judicial branch is the Supreme Court. The Supreme Court's role is to interpret the Constitution and limit the powers of the other branches of government.