The Noahic curse supplied the religious rationale for the American racial system.

Evidence

The Noahic account became the foundation of the three major races underpinning the American racial taxonomy: White, Yellow, and Black. To be American was to be White and the people of God. Religion and race thus became intertwined in justifying the enslavement of Blacks. Put simply, God had ordained Anglo-Protestant supremacy. — Sahar F. Aziz, The Racial Muslim, 221