US had a number of Acquisitions. These are: Louisiana Purchase, Florida, Mexican Cession, Gadsden Purchase, Alaska, Philippine Islands (but they are no longer in the US) and Virgin Islands, purchases from Denmark
The Oregon Trail, the answer you are looking for is, in fact, indubitably, irrefutably, one-hundred percent, surely is The Oregon Trail.
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Battle of the Monitor and Merrimack, also called Battle of Hampton Roads, (March 9, 1862), in the American Civil War, naval engagement at Hampton Roads, Virginia, a harbour at the mouth of the James River, notable as history's first duel between ironclad warships and the beginning of a new era of naval warfare.
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It outlawed the discriminatory voting practices adopted in many southern states after the Civil War, including literacy tests as a prerequisite to voting. This “act to enforce the fifteenth amendment to the Constitution” was signed into law 95 years after the amendment was ratified.Explanation: