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".
The end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The phrase "United States" was originally plural, a description of a collection of independent states—e.g., "the United States are"—including in the Thirteenth Amendment to the United States Constitution, ratified in 1865.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States (OAS), and other international organizations. The singular form—e.g., "the United States is"—became popular after the end of the American Civil War. In English, the word "American" rarely refers to topics or subjects not connected with the United States.
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.
The first Europeans to arrive in the territory of the modern United States were Spanish conquistadors such as Juan Ponce de León, who made his first visit to Florida in 1513; however, if unincorporated territories are accounted for, then credit would go to Christopher Columbus who landed in Puerto Rico on his 1493 voyage.
Spanish set up the first settlements in Florida and New Mexico such as Saint Augustine and Santa Fe.
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After Spain sent Columbus on his first voyage to the New World in 1492, other explorers followed.
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