Answer:
April 17–May 20, 1861
Virginia, Arkansas, Tennessee, and North Carolina secede from the Union. (This event shows that the Confederacy was gaining support in the Southern states.)
April 19, 1861
All Confederate ports are blockaded. (This event shows the power of the Union to control the waterways, even at the very beginning of the war.)
April 20, 1861
Colonel Robert E. Lee resigns from the United States Army. (Robert E. Lee will become a great leader for the South.)
Step-by-step explanation: