After Germany surrendered to sign,the Allied Nations signed as well HOWEVER America turned against the Treaty of Versailles and this chose not to sign. A few other countries signed as well, but those were the main.
During the 1920s and 1930s, the U.S. pursued a policy of <u>isolationism</u>, similar to the time prior to World War I.
United States followed an isolationist policy in the 1920s and 1930s because during the 1930s, the combination of the Great Depression and the memory of tragic losses in World War I contributed to pushing American public opinion and policy toward isolationism.
The isolationism advocated non-involvement in European and Asian conflicts and non-entanglement in international politics. There were some measures taken by U.S. to avoid political and military conflicts across the oceans.
Hence, the leaders of the isolationist movement drew upon history to bolster their position.
To learn more about the policy of isolationism here:
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A nation's "sovereignty" allows it to exercise its political power and authority, since without sovereignty it is unlikely that the nation would be able to keep out outside powers and influence.
