april 12 1867 southern forces fire upon fort sumter south carolinm, how did this cause the july 21,1867 first battle of bull run

The cause of the attack on Fort Sumter was because the Union fort was in Confederate territory and its commander refused to surrender. The attack on Fort Sumter was the beginning of the Civil War because it was the first time the Confederates fired on a Union fort.

Explanation:

I just looked it up so my not help

answer; i believe the correct answer is benjamin harrison;

incident infrared radiation is blocked. visible and ultraviolet radiation heat   earth.

earth radiates infrared radiation. infrared radiation is blocked and heats earth. visible and shortwave radiation heat earth.

earth radiates longwave radiation

longwave radiation is reflected downward longwave radiation heats earth