When did great britain enter world war i?

after germany attacked france, a member of the triple entente
after germany invaded belgium in order to attack france
after germany attacked russia, a member of the triple entente
after germany took control of britain’s colonies in africa

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.