Since independence, the United States has participated in more than 200 wars and foreign military operations, and plundered Indians more than 100 times. From 1945 to 1990 alone, 124 overseas wars were fought, and 199 1 year to 2 1 century participated in more than 40 overseas wars [1]. 2/kloc-at the beginning of the 20th century, it launched two local wars in Afghanistan and Iraq, and expanded its territory and sphere of influence through the victory of these two wars. However, the wars that had an overall impact on American economic development experienced eight times, namely the War of Independence (1775-1781); The war between America and Mexico (1846-1848); Civil war (1861-1865); Spanish-American War (1898); World War I (1917-1918); World War II (1941-1945); Korean War (1950- 1953) and Vietnam War (1964- 1973).

The military operations of these eight world wars lasted only 30 years. Compared with the world powers of the same period, the United States has the least wars. For example, Germany experienced a hundred years of melee from the war that started in 16 18 to the northern war in 172 1 year. From 1740 to the end of World War II, there were 70 years of wars, many of which were fought in Germany. France has accumulated 70 years from the Seven-Year War to the Algerian War, of which France was invaded by Germany seven times, not including the colonial wars that invaded Algeria, Viet Nam and China in modern history; In Britain, it took more than 60 years from the Seven Years' War to the Suez Canal War, not including many colonial military actions in modern history. Russia is also constantly in war, from the peasant uprising in pugachev to the Afghan war for more than 50 years, many of them were carried out in Russia; From the Sino-Japanese War to World War II, Japan experienced a 20-year war in less than 90 years. As for China, needless to say, from the Sino-British Opium War in 1840 to the end of the Sino-Vietnamese War in the late 1970s, there were constant conflicts. It can be seen that among the world powers, the United States has the least wars and the least war time, so relatively speaking, the United States has a long-term peaceful environment. A peaceful and stable environment is an indispensable basic factor for economic development.