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18世纪中后期到19世纪末,美国在“天定命运”思想的影响下,通过西进运动不断开疆拓土,由一个偏居大西洋沿岸的小邦变成横跨北美大陆的大国,历史学家称之为“地理革命”。1776年北美殖民地宣布独立时只拥有大西洋沿岸13个州、约80万平方公里的领土。1783年英国承认美国独立后把13个州以外大西洋沿岸的绝大部分疆域划归美国,美国领土扩大到230万平方公里。联邦政府成立后,先后于1803和1819年向法国购得路
From the late 18th century to the end of the 19th century, under the influence of “fate of destiny ”, the United States continued to expand its territory by moving westwards and becoming a large country across the North American continent from a small state off the Atlantic coast. Historians call it “geo-revolution.” When the North American colonies declared their independence in 1776, they had only about 800,000 square kilometers of territories in 13 states along the Atlantic coast. In 1783, Britain admitted that after the independence of the United States, most of the territories off the 13 Atlantic coasts were assigned to the United States and the United States expanded its territory to 2.3 million square kilometers. After the founding of the federal government, it bought roads to France in 1803 and 1819