History. Linguistics. Care to cite the Biblical passages in question?
And the sons of Ham; Cush, and Mizraim, and Phut, and Canaan. And Mizraim begat Ludim, and Anamim, and Lehabim, and Naphtuhim, / And Pathrusim, and Casluhim, (out of whom came Philistim,) and Caphtorim.Doesnt give their ancestral lands. The Mizraim settled in Egypt, of course, and that stays reflected in even the Arabic name Masry.
Genesis 10:6, 13-14