The United States; a federal constitutional republic, in which the President is head of state and government. Congress and judiciary share powers reserved to the national government. The federal government shares sovereignty with the state governments. The Federal Government is composed of three distinct branches, namely: legislative, executive, and judicial, whose powers are vested by the U.S. Constitution in the Congress, the President, and the Federal courts, respectively.

Legislative power is in the two chambers of Congress, the Senate and the House of Representatives.

Judiciary is made of the Supreme Court and lower federal courts.

The country has a number of government departments; including the Citizenship and Immigration Services (USCIS); which controls the country’s Immigrtion system based on the immigration Act 1990 and Nationality Act 1965.

United States operates within a multi-party system, with the Democratic and Republican Parties as the most influential players.

United States’ GDP is about $25.43 trillion and a population of about 335 Million.