Jackson's election was significant because of his posture as "the common man's" candidate. Jackson was one of the first Presidents elected who did not have the Federalist pedigree of prior candidates. At the same time, he did not possess the "insider" status of his opponent, John Quincy Adams.
truman doctrine is the principle that the US should give support to countries or people's threatened by Soviet forces or Communist insurrection. The invasion of South Korea made Truman genuinely fearful that the Soviet union and China intended to expand the sphere of communism throughout Asia.
