The United States Government is the federal government of the United States of America. Under the United States Constitution, government in the United States is organized according to a system of dual sovereignty. That is, the Constitution enumerates certain powers to the federal government, while the states retain the rest. That principle is inherent in Article I and explicitly stated in the Tenth Amendment.
The Constitution also provides for separation of powers. The legislative power is vested in Congress; the executive power, in the President of the United States of America and in various inferior executive bodies; and the judicial power, in the United States Supreme Court and in various inferior federal courts.