"By 1860, the population of Alabama had increased to 964,201 people, of which nearly half, 435,080 were enslaved African Americans, and 2,690 were free people of color.
On January 11,1861 Alabama declared its secession from the Union. It joined the Confederate States of America soon thereafter. The Confedracy's capital was initially at Montgomery. Alabama was heavily involved in the American Civil War. Although comparatively few battles were fought in the state, Alabama contributed about 120,00 soldiers to the war effort." .. Wikipedia
Here is an interesting account of the war as it impacted Alabama.