By the time in question there was more Catholics in the United States than there was Mexicans as a whole in Mexico itself, and in the 1924 Immigration Act limits were placed on European immigration but not Latin American; race and religious feelings of the time tend to be more gray than Black and White. Specific to the question at hand, to quote from
"An Enemy Closer to Us than Any European Power": The Impact of Mexico on Texan Public Opinion before World War I by Patrick L. Cox,
The Southwestern Historical Quarterly, Jul., 2001, Vol. 105, No. 1 (Jul., 2001), pp. 40-80:
The Wilson administration and the military again blamed the conflict on Villa. Governor Ferguson expressed the feelings of many when he advocated United States intervention in Mexico to "assume control of that unfortunate country." J. S. M. McKamey, a banker in the South Texas community of Gregory concluded, "we ought to take the country over and keep it." As an alternative, McKamey told Congressman McLemore that the United States should "buy a few of the northern states of Mexico" because it would be "cheaper than going to war." The San Antonio Express urged the Mexican government to cooperate with Pershing's force to pursue those who participated in "organized murder, plundering and property destruction."
Congressman J.W. Taylor of Tennessee, addressing Congress:
"If I had my way about it, Uncle Sam would immediately send a company of civil engineers into Mexico, backed by sufficient military forces, with instructions to draw a parallel line to and about 100 miles south of the Rio Grande, and we would...annex this territory as indemnity for past depredations . . and if this reminder should not have the desired effect I would continue to move the line southward until the Mexican government was crowded off [the] North America."