The President is elected every four years from a limited pool of presidential candidates who are chosen by their political parties in the months before the election. Usually the election is between a Republican and a Democratic candidate, because the Republican and Democratic parties are the largest political parties in the United States. It is worth noting that people in each state vote indirectly for their choice for President. The people only vote for the electors who form the electoral college. Each state has a well-established number of electors, which is the same as the number of representatives plus the number of senators representing the state in Congress. The electors will meet after the November election, and vote for the President. Their choice will echo that of the largest number of people in their state.

After F.D. Roosevelt’s presidential tenure, the Federal Constitution was amended to impose presidential term limits. Since 1951, a President may serve only two terms of four years. Amendment XXII - Presidential Term Limits - was passed by Congress on March 21, 1947, and then ratified on February 27, 1951.

The President exercises considerable lawmaking powers. The President exercises them directly, by signing federal bills into law or vetoing them, enforcing the treaties of the United States or by issuing executive orders. Through executive orders Presidents may establish administrative agencies for the purpose of administering a specific piece of legislation, or a specific social and economic problem.

For example, according to the presidential prerogatives decreed by Congress in Chapter 9, title 5 of the United States Code, for instance, President Nixon established the Environmental Protection Agency (EPA) in 1970 through a reorganization plan that consolidated several existing agencies. The United States Government Manual contains the relevant explanations.

The President’s lawmaking powers may be also exercised indirectly, by appointing the Cabinet members, the heads of independent agencies, as well as the Supreme Court justices and the federal courts judges.