Doctrines and Foreign Policy Decisions
Bush- The U.S. can preemptively strike to defend itself.
Truman- The U.S. will assist free people resiting communist takeover.
Marshall (Plan)- The U.S. will spend $ to rebuild Europe after WWII.
Roosevelt (Corrollary)- The U.S. will enforce European claims in the Americas.
Monroe- The U.S. will not allow European colonialism in the Americas.