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United States 或 United States of A·mer·i·ca AHD[ə-mĕrʹĭ-kə] abbr.缩写 U.S.,US,U.S.A.,USAD.J.[əˈmerɪkə]K.K.[əˈmɛrɪkə]NONE（无词性） - 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 original Thirteen Colonies declared their independence from Great Britain in 1776 and formed a government under the Articles of Confederation in 1781. A new constitution, adopted in 1787 and in effect after 1789, provided for a strong central government, and the nation soon began to expand westward. The Civil War (1861-1865) was a brief but tragic disruption in the unity of the nation. Since that time the United States has evolved into a vast, diversified economic power. Washington, D.C., is the capital and New York the largest city. Population, 249,632,692.美国：北美洲中央和西北面的一个国家，海岸线在太平洋和大西洋。它包括非邻近的阿拉斯加州、夏威夷洲和在加勒比海、太平洋中的许多岛屿领土。原来13个殖民地在1776年从大不列颠宣布独立，在1781年按照联邦条款组成政府。1787年采用、1789年以后生效的新宪法，服务于强有力的中央政府，此国家不久向西扩展。内战(1861-1865年）在国家的联盟内是一次短暂的但悲惨的破坏，自那时以后美国已发展成有巨大的、多方面的经济强国。华盛顿D.C.是首都，纽约是最大的城市。人口249,632,692
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