Secession and Fort Sumter: The war began in April 1861 when Confederate forces attacked Fort Sumter in South Carolina, a federal fort. This event prompted additional states in the South to secede from the Union and join the Confederacy.
Military Strategies: The war saw major battles, including the First Battle of Bull Run, Antietam, Gettysburg, and Vicksburg. The Union employed a strategy of economic blockade and a campaign to seize control of the Mississippi River, while the Confederacy relied on a defensive strategy and attempted to secure foreign recognition and support.
Emancipation Proclamation: In 1862, President Abraham Lincoln issued the Emancipation Proclamation, declaring enslaved people in Confederate-held territory to be free. This transformed the Union's war aims, making the abolition of slavery a central goal.