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What major challenge did Americans face after

winning the colonies war?

Fighting against France

Trading with the British

Forming a new government

Forming a new government

The answer is "Forming a new government."

Explanation:

It is said that the easy part is winning the war, but the hard part is winning the peace. After having won their independence from Britain, the first Americans had to agree on a system of government to administrate the new country, how to elect their leaders and how to organize justice and the economy.