Sorghum is not from sugar cane or sugar beets. It comes from an Old World grass that has spikelets, and growth a little like corn. A syrup is derived from the juice in its stems. Much is grown in the US but most is used to feed livestock, either as fodder or as silage. A little molasses made from sorghum is sold as a cheap substitute for molasses, mostly in the south.
Corn syrup (Karo is one brand) is common.