The Samaritans were the descendents of the Northern Kingdom. Following Solomon's death, the Northern and Southern Kingdoms split. Jeroboam led the Northern Kingdom after that. It was downhill into apostasy and conquest by foreigners. Those of the 10 tribes that constituted the NK intermarried with non-Hebrews. Hence, those of the Southern Kingdom looked upon then as half-breed, certainly barely good enuf to be held in contempt.
The story of the Good Samaritan takes on much more meaning when seen in this light.
Sumerians and the Anunnaki.