Final answer:
President Reagan changed the U.S. foreign policy on communism by wanting to roll back communism rather than supporting it.
Step-by-step explanation:
President Ronald Reagan changed the U.S. foreign policy on communism by wanting to roll back communism rather than supporting it. His strategy, known as the Reagan Doctrine, involved providing aid to anti-Communist groups fighting against Communist forces worldwide.
Reagan's approach relied on finding allies and supporting covert operations, rather than deploying large numbers of US troops.