Why did Roosevelt give his liberty of the people speech?

The Four Freedoms Speech was given on January 6, 1941. Roosevelt's hope was to provide a rationale for why the United States should abandon the isolationist policies that emerged from World War I. ... In the future days, which we seek to make secure, we look forward to a world founded upon four essential human freedoms.

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nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.

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