After his victory of the union in Virginia, he decided to take the fight to Maryland because it was a slave holding state.
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The United States used the sinking as propaganda to get the country on board for war
The period immediately after the Civil War when the South rebuilt and the southern states returned to the Union. An amendment to the U.S. Constitution, ratified in 1868, granted citizenship to all born in the United States; this broad language included former slaves.