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United States or United States of America Abbr. US or U.S. or USA or U.S.A.
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A country of central and northwest North America with coastlines on the Atlantic and Pacific Oceans. It includes the noncontiguous states of Alaska and Hawaii and various island territories in the Caribbean Sea and Pacific Ocean. The area now occupied by the contiguous 48 states was originally inhabited by numerous Native American peoples and was colonized beginning in the 1500s by Spain, France, the Netherlands, and England. Great Britain eventually controlled most of the Atlantic coast and, after the French and Indian Wars (1754-1763), the Northwest Territory and Canada. The original Thirteen Colonies declared their independence from Great Britain in 1776 and formed a government under the Articles of Confederation in 1781, adopting (1787) a new constitution that went into effect after 1789. The nation soon began to expand westward. Growing tensions over the issue of black slavery divided the country along geographic lines, sparking the secession of the South and the Civil War (1861-1865). The remainder of the 1800s was marked by increased westward expansion, industrialization, and the influx of millions of immigrants. The United States entered World War II after the Japanese attack (1941) on Pearl Harbor and emerged after the war as a world power. Washington, DC, is the capital and New York the largest city.
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United States of America

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

Indo-European & Semitic Roots Appendices

    Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

    Indo-European Roots

    Semitic Roots

    The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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