He used the Assyrians, one of the most brutal warrior nations in history, to invade, conquer, enslave and relocate the entire northern kingdom of Israel (II Kings 17). Having “disappeared” from history, the modern-day descendants of those ten “lost” tribes are unaware of their true identity even to this day.
Later, God sent the southern kingdom of Judah (mainly the tribes of Judah, Benjamin and Levi) into Babylonian exile (II Kings 24 and 25). Because they kept (at least physically) the true Sabbath, which is a special sign that identifies the one true God and His people (Ex. 31:12-18), the Jews were able to retain their true identity.