According to the Census Bureau, the pretax median household income in 2006 was $48,201. The two-year average ranged from $66,752 in
According to the Census Bureau, the pretax median household income in 2006 was $48,201. The two-year average ranged from $66,752 in
The
The private sector constitutes the bulk of the economy, with government activity accounting for 12.4% of GDP. The economy is postindustrial, with the service sector contributing 67.8% of GDP. The leading business field by gross business receipts is wholesale and retail trade; by net income it is finance and insurance. The
In 2005, 155 million persons were employed with earnings, of whom 80% worked in full-time jobs. The majority, 79%, were employed in the service sector. With approximately 15.5 million people, health care and social assistance is the leading field of employment. About 12% of American workers are unionized, compared to 30% in
The
American isolationists have often been at odds with internationalists, as anti-imperialists have been with promoters of Manifest Destiny and American Empire. American imperialism in the
The president holds the title of commander-in-chief of the nation's armed forces and appoints its leaders, the secretary of defense and the Joint Chiefs of Staff. The United States Department of Defense administers the armed forces, including the Army, the Navy, the Marine Corps, and the Air Force. The Coast Guard falls under the jurisdiction of the Department of Homeland Security in peacetime and the Department of the Navy in times of war. In 2005, the military had 1.38 million personnel on active duty, along with several hundred thousand each in the Reserves and the National Guard for a total of 2.3 million troops. The Department of Defense also employs approximately 700,000 civilians, disregarding contractors. Military service is voluntary, though conscription may occur in wartime through the Selective Service System. The rapid deployment of American forces is facilitated by the Air Force's large fleet of transportation aircraft and aerial refueling tankers, the Navy's fleet of eleven active aircraft carriers, and Marine Expeditionary Units at sea in the Navy's
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The states compose the vast bulk of the
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The federal government is composed of three branches:
* Legislative: The bicameral Congress, made up of the Senate and the House of Representatives, makes federal law, declares war, approves treaties, has the power of the purse, and has the power of impeachment, by which it can remove sitting members of the government.
* Executive: The president is the commander-in-chief of the military, can veto legislative bills before they become law, and appoints the Cabinet and other officers, who administer and enforce federal laws and policies.
* Judicial: The Supreme Court and lower federal courts, whose judges are appointed by the president with Senate approval, interpret laws and can overturn laws they deem unconstitutional.
The House of Representatives has 435 members, each representing a congressional district for a two-year term. House seats are apportioned among the fifty states by population every tenth year. As of the 2000 census, seven states have the minimum of one representative, while
All laws and procedures of both state and federal governments are subject to review, and any law ruled in violation of the Constitution by the judicial branch is overturned. The original text of the Constitution establishes the structure and responsibilities of the federal government, the relationship between it and the individual states, and essential matters of military and economic authority. Article One protects the right to the "great writ" of habeas corpus, and Article Three guarantees the right to a jury trial in all criminal cases. Amendments to the Constitution require the approval of three-fourths of the states. The Constitution has been amended twenty-seven times; the first ten amendments, which make up the Bill of Rights, and the Fourteenth Amendment form the central basis of individual rights in the
The leadership role taken by the
The 1990s also saw a rise in Islamic Terrorism against Americans from al-Qaeda and other groups, including an attack on the World Trade Center in 1993, an attack on U.S. forces in Somalia, the 1996 Khobar Towers bombing, the 1998 United States embassy bombings in Tanzania and Kenya, the 2000 millennium attack plots, and the USS Cole bombing in Yemen in October 2000. In
The presidential election of 2000 was one of the closest in
Using language from the 1998 Iraq Liberation Act and the Clinton Administration, in 2002 the Bush Administration began to press for regime change in
In the upcoming 2008 presidential election, the Republican Party candidate, four-term Senator John McCain of
The
The Soviet Union launched the first manned spacecraft in 1961, prompting U.S. efforts to raise proficiency in mathematics and science and President John F. Kennedy's call for the country to be first to land "a man on the moon," achieved in 1969. Kennedy also faced a tense nuclear showdown with Soviet forces in
As a result of the Watergate scandal, in 1974 Nixon became the first
At the outbreak of World War I in 1914, the

During most of the 1920s, the

On December 7, 1941, the
Tensions between slave and
Tensions between American colonials and the British during the revolutionary period of the 1760s and early 1770s led to the American Revolutionary War, fought from 1775 through 1781. On June 14, 1775, the Continental Congress, convening in
After the defeat of the British army by American forces who were assisted by the French,