Mexico (USA Territory Flag)

In 1848, the Treaty of Guadalupe-Hidalgo, where the Republic of Mexico is completely annexed by the United States of America was signed.

Mexico ceases to exist as a country and is divided into 4 more states and several territories, the state of Mexico in the center, the state of Sonora and the state of San Luis and the state of Guanajuato, more territories with large indigenous population is slowly annihilated.

This could make the United States, on closer to Nazi Germany power, almost 100 years before that nation with genocide and concentration camps. And do much more bloody civil war in that country but delaying it until the late nineteenth century.