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Isolationism contributed to the "march of aggression" because it allowed the aggressors to get what they wanted without having to worry about other countries interfering with them.
During this time, countries like Britain and, especially, the United States, were pursuing a policy of isolation. Therefore, they did not interfere when other countries like Germany and Japan started to act aggressively. When Germany took the Sudetenland and Czechoslovakia, neither country did anything. When Japan invaded China, neither country did anything.
When countries like the US and Britain did not oppose these acts of aggression, Japan and Germany continued to be aggressive, thus helping to bring on WWII.
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