Who said we are all one mestizo race from Mexico to Argentina?

The statement that "we are all one mestizo race from Mexico to Argentina" is not factually accurate. While there is significant mestizo (mixed European and Indigenous American) heritage in many Latin American countries, including Mexico and Argentina, the racial and ethnic makeup of the region is diverse and includes various Indigenous, European, African, and other ancestral backgrounds. It is essential to recognize and respect the distinct identities and heritages of different groups within Latin America rather than generalizing them into a single monolithic category.