Actually, I think the white people of America already paid that price, in a civil war with well over 600,000 white Americans killed. Though to be fair about 40% of those were fighting on the other side.
“with well over 600,000 white Americans killed”
Uuuuuh . . . that’s just the ones in uniform, there were a lot civilians killed too.
http://en.wikipedia.org/wiki/Military_history_of_African_Americans_in_the_American_Civil_War
"The history of African Americans in the American Civil War is marked by 186,097 (7,122 officers, 178,975 enlisted)[1]:12 African Americans comprising 163 units who served in the Union Army during the Civil War, and many more African Americans who served in the Union Navy. Both free African Americans and runaway slaves joined the fight."
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The most widely known battle fought by African Americans was the assault on Fort Wagner, South Carolina, by the 54th Massachusetts Infantry on July 18, 1863. The 54th volunteered to lead the assault on the strongly fortified Confederate positions. The soldiers of the 54th scaled the fort's parapet, and were only driven back after brutal hand-to-hand combat. Despite the defeat, the unit was hailed for its valor which spurred further African-American recruitment, giving the Union a numerical military advantage from a population the Confederacy did not attempt to exploit until the closing days of the war.
African American soldiers participated in every major campaign of 186465 except Sherman's Atlanta Campaign in Georgia. The year 1864 was especially eventful for African American troops. On April 12, 1864, at the Battle of Fort Pillow, Tennessee, Confederate General Nathan Bedford Forrest led his 2,500 men against the Union-held fortification, occupied by 292 black and 285 white soldiers. After driving in the Union pickets and giving the garrison an opportunity to surrender, Forrest's men swarmed into the fort with little difficulty and drove the Federals down the river's bluff into a deadly crossfire. Casualties were high and only sixty-two of the U.S. Colored Troops survived the fight. Many accused the Confederates of perpetrating a massacre of black troops, and the controversy continues today. The battle cry for the Negro soldier east of the Mississippi River became "Remember Fort Pillow!"