5. After the United States declared war, the nation’s economic situation . worsened improved stalled remained unchanged

if it's ww2 it improved

Explanation:

The US was in the time of the great depression. Many people had lost their jobs and the economy was bad. Because the US declare war on Japan, as well joining the allies to defeat Germany. They needed people to create weapons, join the army aswell as other jobs. This help pull the US out of the create depression. Hope this helped.

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newly independent countries of the former ussr