Which statement about american foreign policy in the late twentieth century is true? a. u. s. military forces invaded the soviet union to bring about the fall of communism in 1989. b. no president since the end of the vietnam war has sent u. s. forces to fight in a foreign country. c. since 1980, the united states has taken military action in eastern europe, the middle east, africa, and the caribbean. d. congress has issued a formal declaration of war on three separate occasions since 1975.