The European nations which were in control of the North American continent just a few centuries ago were the British empire, the French empire and the Dutch.
Lewis and Clark was sent to explore the Louisiana territory.
<span>Further reading indicates the Native Americans provided a great deal of ready to eat food (corn, beans, squash, pumpkins, dried meat and fish, acorns, berries, etc.) as they were better farmers than the Europeans up until 20th Century yields.
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The American defeat of the superior British army lifted patriot morale, furthered the hope for independence, and helped to secure the foreign support needed to win the war