Andrew Jackson.
Our People: Views and Observations on the Population of the United States of Mexico was a book published in Mexico City in 1841 by former President Andrew Jackson.
Sobel cites Jackson's book when discussing his racial views in Chapter 10: "The Taking of the West." He notes that Jackson regarded the people of Mexico as belonging to two groups: the majority, who came to be known as Mexicanos, were descended from the settled Indians of pre-Columbian Mexico, and Sobel describes them as "usually Spanish-speaking, at times pagan, who were centere in Chiapas and Durango; the minority, the Hispanos, were descendants of the Spaniards who had conquered Mexico in the sixteenth century. Sobel quotes Jackson's remark that "In the veins of some Mexicans flows Spanish blood, and glimpses of the conquistador may be seen from time to time." Sobel notes that Jackson either did not know, or refused to believe, that the two groups had been intermarrying for centuries, and that few Hispanos could claim to be "pure-blooded" in his sense of the term.
Sobel also describes Jackson's views on the Negrooes, stating that Jackson was a staunch defender of slavery not only on economic grounds, but due to his utter disregard of the Negro as a human being. He notes Jackson's claim in Our People: Views and Observations that the one piece of legislation he was never able to win, but which he felt necessary to the country's greatness, was his 1826 bill to enslave all those who had more than one Negro grandparent.
Our People: Views and Observations appears in Sobel's bibliography.