British Israelites, et al
Many Jews believe there are no Lost Tribes of Israel. They think the huge Northern Kingdom was assimilated into the smaller Southern Kingdom after the Assyrian captivity. They don't acknowledge that only a small percentage of Israelites were ever called Jews, and those came only from the Southern Kingdom, barely existing today as less than 15 Million among their One Billion white European and American cousins.
The truth lies somewhere between these two extreme and historically
unsupported positions.