What is so fascinating to see is how leftists try to spin the fact that slavery was global. All races and ethnic groups enslaved others and were enslaved. 500,000 Chinese slaves died building the Great Wall of China, and they just tossed their bodies in the construction area and covered them up.
Slavery was widespread all over the Americas before Columbus and post Columbus every territory, colony and future country had slavery. Canada didn't have that much due to climate. There is nothing unique about the USA in this matter, it was 100% normal back then. Slaves in the colonies/USA were treated much better, had better living conditions, food, and long lives compared to what happened on the big corporate type plantations in the Caribbean and parts of S. America.