The United States is a highly developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for approximately a quarter of global GDP. Joseph Reed, Moylan expressed his wish to carry the "full and ample powers of the United States of America" to Spain to assist in the revolutionary war effort. The singular form is now standard; the plural form is retained in the idiom "these United States". S." refer to the country adjectivally ("American values", "U. Monks Mound in Cahokia, a UNESCO World Heritage Site and the largest and most influential settlement in Mississippian culture.In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci (Latin: The first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq., George Washington's aide-de-camp and Muster-Master General of the Continental Army. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the 'United States of America The short form "United States" is also standard. The difference is more significant than usage; it is a difference between a collection of states and a unit. The concrete staircase follows the approximate course of ancient wooden stairs.Bad weather forced his ships south to about 43° north before they could begin their exploration of the coast northward.In March 1778, Cook landed on Bligh Island and named the inlet "King George's Sound".
The state of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones.In 1774 the Spanish Navy ship Santiago, under Juan Pérez had entered and anchored in the inlet at Nootka Sound.Although the Spanish did not land, natives paddled to the ship to trade furs for abalone shells from California.The United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, and a permanent member of the United Nations Security Council.During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 moon landing. "Columbia", a name popular in poetry and songs of the late 18th century, derives its origin from Christopher Columbus; it appears in the name "District of Columbia".