The best and most correct answer among the choices provided by your question is the fifth choice.
All of the given choices are correct concerning <span>the constitutional structure within the Articles of Confederation (1781-1789).</span>
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I’ll give you a few to choose from:
-There were plenty of jobs (but low-paying) in America
-Gold Rush
-America had an open door policy (at least until the immigration act)
-Social mobility was possible (unlike restrictive social classes in England)
The Potsdam Conference<span>, 1945. The Big Three—Soviet leader Joseph Stalin, British Prime Minister Winston Churchill (replaced on July 26 by Prime Minister Clement Attlee), and U.S. President Harry </span>Truman<span>—met in </span>Potsdam<span>, Germany, from July 17 to August 2, 1945, to negotiate terms for the end of World War II.
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i think they were united countries i could be wrong hope it help