Which countries support was crucial to the us during its war for independence?

Hello.

The answer is: France

The support of France was crucial to the US during its war for independence. France was the most important support to congress at that time. France's defeat to Britain in the Seven Years War motivated the country to join the Americans in their fight with Britain.

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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.