What economic and political steps did the global community take after World War II to avoid future wars?

The UN (United Nations) was created at the end of WWII as an international peacekeeping organization for resolving conflicts between nations. United States took action to create treaties with the naval forces of Great Britain, Japan, Germany, etc. A common market for important natural resources was created between Germany and France to prevent another war.

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although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

during the hitler era and it caused them to declare war on germany