Won is the correct word in the sentence.
Western North America was inhabited for a millennia by various groups of Native Americans and later served as a frontier to European powers, beginning with Spanish colonization in the 16th century. British, French, and Russian claims followed in the 18th and 19th centuries. After the American Revolution, the newly independent United States began securing its own frontier from the Appalachian Mountains westward for settlement and economic investment by American citizens.
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Answer:
<h2><em><u>C. Civil war </u></em></h2>
Explanation:
<em><u>The American Civil War from April 12, 1861 to May 9, 1865,</u></em> was a civil war in the United States fought between northern and Pacific states ("the Union" or "the North") and southern states that voted to secede and form the Confederate States of America ("the Confederacy" or "the South").