Answer:
He established a naval blockade around the South, is the right answer.
Explanation:
In the Civil War of America, the then President of the United States, Abraham Lincoln, initiated a naval strategy, known as the Union blockade. This strategy was employed to block the Confederacy from trading. The main reason for employing this strategy was the challenge, the Confederacy gave to Lincoln by leaving the union considering it a right of the state, and attacking Ft. Sumter, April 12, 1861.
