what did the north use to limit south's trade
Union blockade The Union blockade in the American Civil War was a naval strategy by the United States to prevent the Confederacy from trading.
Southern United States The South does not fully match the geographic south of the United States but is commonly defined as including the states that fought for the Confederate States of America in the American Civil War.[2] The Deep South is fully located in the southeastern corner. Arizona and New Mexico, which are geographically in the southern part of the country, are rarely considered part, while West Virginia, which separated from Virginia in 1863,[3] commonly is.[4][5][6] Some scholars have proposed definitions of the South that do not coincide neatly with state boundaries.[7][8] While the states of Delaware and Maryland, as well as the District of Columbia, permitted slavery prior to the start of the Civil War, they remained with the Union. Since the Civil Rights Movement of the 1960s, they became more culturally, economically, and politically aligned with the industrial Northern states, and are often identified as part of the Mid-Atlantic or Northeast by many residents, businesses, public institutions, and private organizations,[9][10][11][12][13]but the United States Census Bureau puts them in the South.