the union flag is just as much a symbol of hatred as the confederate
they had factories much worse than slave conditions and most people in it wouldn't of freed the slaves if it didn't benefit the union militarily
So, let me get this straight:
Working in a stuffty sweatshop, voluntarily, for too many hours a day is comparable to backbreaking, involuntary labor performed all-day at the mercy of someone who will literally kill you if you don't do it?
Also, the Union didn't pursue emancipation because of economic reasons. If they did, they would have let the South keep slavery because it provided a steady stream of cheap cotton for Northern textile manufacturers. The reason why the Civil War broke out was primarily because Northerners found it ethically reprehensible that the South wanted them to send back escaped slaves under the Fugitive Slave Act.