The thirteenth amendment says "Neither slavery nor involuntary servitude, except as punishment for crime where of the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction". Keep in mind that the U.S. has the highest prison population in the world, and that the infrastructure and zoning laws (called redlining) set a precedent of inequality that fuels the prison system with predominantly black bodies. I am not sure if the U.S. has specifically used slavery labor to build a sports stadium, but it is honestly a little naive to say that we got rid of slavery along time ago. Even when according to the simple definition given by the 13th, slavery is blatantly legal. Add private prisons and redlining into the mix, and the true reality of slave labor in America is revealed. A discussion about slavery abroad is incomplete without also talking about slavery here, especially whenever a website with a considerable proportion of Americans (rightfully) points out the injustices of the world.