Yes. I'd divide the US into six countries:

Aztlan: The south west US, south west texas, California, Arizona and Nevada goes to Mestizos.

Kangland: The Black belt running through the South becomes a separate country. These two countries will serve as a buffer between the other states and Central America.

New Isarel: News York City and New Jersey with a connecting tissue of the Atlantic coast. This becomes the Jewish country.

Peutro Rico: Independence

Confederacy of the South: Appalachia, mid atlantic and the remainder of the south. I think its best to recognize that white southerners have a conception of themselves as a separate nation, descended from Scots-Irish and English Cavaliers.

New Europe/Germania: The remainder of the US, including New England, the Midwest, the far west including Washington and Oregon.

Alaska goes to Russia or Canada, whoever among them is willing to buy it or take it that is.

The result will be two White states each starting out as 80% or more white. With population transfers over time, mostly sending Blacks to the Afro state and Mexicans to Aztlan, it can reach 90%.