It was Tecumseh. He got killed in the Battle of the Thames when he was siding with the British in the war of 1812.
USA intervened in Korea and Vietnam as war efforts and in Greece and Turkey as coups.
Explanation:
In Turkey the US government aided a coup by the military to overthrow the government which in turn led to a regressive government to be placed in there.
A similar thing happened in Greece when a socialist party was elected into the Country with affiliations or alleged ones with the Soviet Union.
Korea was invaded by the USA in support of the south during the Korean war so as to stop the communist North from taking over all of the Korea under the influence of USSR.
Similar thing happened in Vietnam but it was not successful and Vietnam did fall to the communist army after US departure.
Answer:
They did not have the most advanced military equipment.
They were small nations with small populations.
There was a lack of unity among members of various groups.
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B. common ancestry because immigrants have in the past (think Ellis Island) and still do come from many different countries to live in the U.S.