So is this just for black kangz or is it for other ethnosupremacist weirdos too like all the Indian weirdos who believe Hindu mythology literally happened and that the Indians are the inventors of civilization? Might want to reflect that in the OP.
The equivalent of kangery for whites was more popular back in the 19th century but oddly enough rarely involved white Europeans and it's usually the Egyptians (who were white) or the Twelve Tribes of Israel (in the Old Testament, who were white before they became the Christkilling modern Jews). White people claimed the Egyptians and Israelites accomplished every single achievement Africans ever did. White Egyptians or ancient Israelites taught black Africans agriculture and civilization itself and built all the great African civilizations from Ethiopia (which to be fair did have a large ancient Arab component) to Mali to Great Zimbabwe. Interestingly some of this is based on earlier actual African folklore where some West African peoples claim they are descended from the Ancient Egyptians or even medieval Islamic Egyptians or that their kings were/are of Egyptian heritage.
It's also claimed that Ancient Egyptians and/or Israelites went to the Americas and helped the Indians build all the mounds and cliff cities and other achievements that the Indians built. They also helped the Mesoamericans build their own pyramids (because obviously nobody ever thought of piling mud in a triangle shape besides Egyptians). The most famous example of this is Mormonism which claims a bunch of Jews went to the United States 2,000 years ago, built a huge civilization, God and Jesus and angels talked to them there, and when their civilization fell into wickedness and God destroyed it they wrote the Book of Mormon on some plates which God later helped some random weirdo named Joseph Smith find and translate.
Most of this moderate flavor of kangery died out when it became politically incorrect to say whites built every culture's great monuments but it mutated and still survives in the form of ALIENS DID IT. It also survives in the white people version of Nation of Islam (not Scientology like is sometimes claimed) which is esoteric Hitlerism and other neo-Nazi occultism. It's the exact same themes as black UFO cults, like how whites are superpowerful beings from another star system, white people created Atlantis, Nazi UFOs, etc. and the only reason whites don't rule the world is because an evil being made the Jews rule the world instead.