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   Germany and the Soviet Union signed a ten-year nonaggression pact. Germany and the Soviet Union signed a ten-year nonaggression pact.
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   A skirmish between Chinese and Japanese troops broke out at the Marco Polo Bridge A skirmish between Chinese and Japanese troops broke out at the Marco Polo Bridge
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   Hitler's troops marched into Austria and annexed the country. Hitler's troops marched into Austria and annexed the country.
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   Japan dropped a bomb on Pearl Harbor. 3,000 Americans were killed and 6 battleships were destroyed. Japan dropped a bomb on Pearl Harbor. 3,000 Americans were killed and 6 battleships were destroyed.
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   Roosevelt advocated collective action to stop the epidemic aggression. But his hopes of igniting American sensibilities failed. Roosevelt advocated collective action to stop the epidemic aggression. But his hopes of igniting American sensibilities failed.