I believe you guys are generalising American foreing policy a little too much.
From about 1788-1860 (after the ratification of the Constitution 'till before the Civil War) American's intention was to EXPAND. Weather by taking the land of the Indians, buying it from the French, or taking it from Mexico. Everheard of Manifest Destiny????
But right before the Civil War the issue of Slavery prevented any further expansion North or South of the continent.
After the Civil War America's intention turn to Imperialism (well actually before the Civil War, America had forfully open up Japan to foreing trade, but any further Imperialistic expansion was interrupted by the Civil War). JUST LIKE ALL OTHER EUROPEAN POWERS OF THE TIME. Due to the European Powers already having colonies or economic influences in most of the world, the US turn to open up Japan, and to kick any European powers out of South America, (especifically Spain). That way effectively making "American for Americans". The US also took over Spanish colonies in South East Asia, and took over the Hawaii.
However, WWI started to somewhat put the breaks that Imperialist trend the world powers where having, plus most of the world was already under some power's influence. That is why when Japan started its Imperialistic campains in China and South East Asia, it came into MAJOR diplomatic confrontation with the Europeans and Americans. So bad that the US cut Oil Exports to Japan and Japan decided it cold destroy the US Pacific Fleet (which it almost did) and give itself time to finish up in Manchuria and grow its Navy even more. So it could effectively fight the Americans when they returned.
After WWII, it was the COLD WAR.
The Soviets wanted to expand Communism and the Americans wanted to stop them. Both sides used any means nessesary but comming short of provocing eachother into direct nuclear confrontation. (especially after the scare of 1962).
ex:-The USSR backed North Korea and China during the Korean war but it didn't become directly involved. It did the same in Vietnam. In Angola the USSR equiped Cubans and the MPLA to fight there. (my brother almost went there)
-The US trainned and equiped Cuban exhiles to take Cuba from Fidel. Also the US backed the Mujahadim (sp) in Afganistan. The US backed the Contras in Nicaragua....
.... there are many more "Small wars" in South America, Africa, South East Asia, Middle east, that followed this pattern.
The interesting thing is, that in this time the US decided to take an "Adult Supervision" approach to foreing policy. Where the US and Nato will hold off the Soviets, but the US will share most of the expense. As a result, this didn't compel the other members of Nato to become again a major military power. Plus, the US basically forbade Japan from becomeing another world power by putting in its Constitution that Japan should only have a "Security Force" not a military capable of expanding. (to this day Japan has Security Force)
After the Cold War:
-The US being the sole world Power, and continuing its "Adult Supervision" approach to foreing policy. Goes into war, imposes sactions, etc. to any nation who threatens its ECONOMIC INTERESTS and its SECURITY. Just like any other nation would do in its place and ALL nations, empires, etc have done before.
In the case of Iraq, the leaders here got really overconfident expecting the Invasion of Iraq to flow like the Invasion of Panama in 1989. Which it aint ....
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