Which factors contributed to the U. S. failure in Vietnam? Choose all answers that are correct.

The United States overestimated the cost and length of the war.

The United States did not study Vietnamese history or ask enough questions.

China and Vietnam had been close allies for centuries.

The Vietnamese had expert guerrilla fighters.

Where did the term “iron curtain” originate? the warsaw pact used the term iron curtain as a code word for communism. in a 1946 speech, british prime minister winston churchill said an iron curtain had fallen across the continent of europe. while visiting western europe in 1946, u.s. president harry truman commented that the mountains there looked like iron curtains. russian general secretary joseph stalin instructed citizens of eastern europe to hang iron curtains over their windows to protect themselves from stray bullets.