| abstract
| - The United States of America is unique in that it was the first of several modern nations to consist entirely of the descendents of migrants settled in a new land in known history, compared to other contemporary republics such as those of the Netherlands or Italy, which were founded around a self-identified region (Netherlands ) or long-established culture (Italy). Other precedents notable of having the same political development were Carthage and the Greek colonies of ancient antiquity, but even so these nations had long perished by the time the American Constitution was ratified and sanctioned as the governing law of the fledgling American nation. Initially composed of communities of Protestant Anglo-Saxons and assimilated Amerindian tribes settled upon the Atlantic seaboard, this nation was formed in the crucible of a revolutionary uprising against the British, abetted by the French and Spanish, then expanded westward while assimilating new migrants from Europe and Asia. The United States first chose to cut itself off from the world and concentrated on the Western Hemisphere, deeming it its own sphere of influence, but eventually became strong enough to emerge as a global power in its own right, beginning in the middle of the First World War in 1917. Following the Cold War in the late 20th century, the United States emerged as the world's sole superpower, boasting the largest economy and most powerful military, exerting enormous cultural and intellectual influence worldwide. However, such influence and prestige has not come without attracting the envy and ire of other parties, and as such, the United States is much contemned yet respected by the so-called "enemies of the free world", and countless challenges to American influence (and possibly survival) can be forseen for the immediate future.
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