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The earlier mysteries are said to have foreseen the end of World War I and the start of World War II , and the rise and fall of Soviet communism . Barnard moved back to the United States on the eve of World War I and , at the northern tip of Manhattan , opened a museum housing his own collection of medieval art . As a result of World War I and changes in immigration law in the early 1920s , the level of immigration fell significantly . The wave of emigration only came to an end with the outbreak of World War I and the more restrictive U.S. immigration laws of the 1920s ( Bade 1992 ) .