Comparatively, adjusting for inflation, the two biggest cash crops were Cotton and tobacco and they yielded approximately 14 Trillion dollars in 1860 alone.
The United states would most likely only encompass the original 13 colonies without African-Americans. The rest of the land would still belong to the French, Mexico, the Spanish, The Dutch, Russia and Canada.
Because of Slavery, America was able to buy land and expand. One reason why monetary reparations will never happen is because whites don't want to admit that their "homeland" was built on the back of blacks.
Also, the western entertainment industry wouldn't be as successful as it is today if there were no black actors, athletes, singers etc...
Jewish slave trade of niggers slowed down the industrialization of the United States, and today they are an enormous drain of resources. Blacks have always been beasts of burden.