As I believe Billy Graham said, “If God doesn’t pass judgement on America, he owes Sodom and Gomorrah an apology.”
Exactly. Remember the 110 inches of snow in Boston last winter? Or the flooding that recently happened in Charleston, SC? Nothing is a coincidence. This won’t be the first time God removed His protection from the USA. The Protestant theologian Beverly La Haye once pointed out that God allowed Satan to almost destroy the USA over the sin of slavery. Of course, most Americans are so stiff-necked they refuse to put 2 + 2 together.
I've never read where God considered slavery a sin. I believe God expected those who had slaves to treat them well and allow them the Sabbath to rest.
I would be interested in the scripture that speaks directly to slavery as sin.