In Ephesians 2:14, what did Christ tear down to make Jew and Gentile one?

Answer: The dividing wall

Christ is our peace: He made the two one and tore down the dividing wall of hostility, reconciling both to God through the cross.

“For He Himself is our peace, who has made the two one and has torn down the dividing wall of hostility”— Ephesians 2:14 (BSB)