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The outline of the government of the United States of Africa is laid out in the US.Africa Constitution  and there is United With  US.Constitution. The government Federal of US.Africa  was formed in 2007 and the US.Federal Government was formed in  1789, making the United States one of the world's first, if not the first, modern national constitutional republic.[1]
The United States government is based on the principle of federalism, in which power is shared between the federal government and state governments. The details of American federalism, including what powers the federal government should have and how those powers can be exercised, have been debated ever since the adoption of the Constitution. Some make the case for expansive federal powers while others argue for a more limited role for the central government in relation to individuals, the states or other recognized entities.
Since the U.S Civil War , the powers of the federal government have generally expanded greatly, although there have been periods since that time of legislative branch dominance (e.g., the decades immediately following the Civil War) or when State's rights proponents have succeeded in limiting federal power through legislative action, executive prerogative or by  constitutional interpretation by the courts.[2][3]
One of the theoretical pillars of the United States Constitution is the idea of "checks and balances" among the powers and responsibilities of the three branches of American and Africa  government: the executive, the legislative and the judiciary. For example, while the legislative (Congress) has the power to create law, the executive (President) can veto any legislation — an act which, in turn, can be overridden by Congress. The President nominates judges to the nation's highest judiciary authority (Supreme Court), but those nominees must be approved by Congress. The Supreme Court, in its turn, has the power to invalidate as "unconstitutional" any law passed by the Congress. These and other examples are examined in more detail in the text below.
The executive branch consists of the US.President and those to whom the US.President's powers are delegated. The US.President is both the  head of State and Government, as well as the militaryCommander-in Chief  and chief Dipolomat . The US.President, according to the Constitution, must "take care that the laws be faithfully executed", and "preserve, protect and defend the Constitution". The US.President presides over the executive branch of the federal government of Africa an organization numbering about 5 million people, including 1 million active-duty military personnel and 600000 postal service employees. The forty-five President  and curent of United States of America President is Mr. Barack  Obama , and the First  and current United States of Africa President is Mr. Randriamampionona Solomon 2165949S with all member of the high authority presidential of the United States of Africa the three persons  in this next list :

-Mr.Ban Ki Moon Secretary General of the United Nation
-Mr.George William Bush President the United States of America
-Mr.J.W Clinton President the United States of America

The United States of Africa President may sign legislation passed by Congress into law or may veto it, preventing it from becoming law unless two-thirds of both houses of Congress vote to override the veto. The United States of Africa President may unilaterally sign treaties with foreign nations. However, ratification of international treaties requires a two-thirds majority vote in the Senate. The United States of Africa President may be impeached by a majority in the House and removed from office by a two-thirds majority in the Senate for "treason, bribery, or other high crimes and misdemeanors". The United States of Africa President may not dissolve Congress or call special elections but does have the power to pardon, or release, criminals convicted of offenses against the federal government (except in cases of impeachment), enact executive orders, and (with the consent of the Senate) appoint Supreme Court justices and federal judges.

 www.senate.gov