Slavery is essential

I agree with you that the great development of your colony, and of the other colonies of Texas, depends among other things, upon permitting their inhabitants to introduce slaves; that by such action many men of property will come; and that without it only the wretched will come who cannot advance the province. But, my friend, in my Congress such arguments were not listened to. On the contrary, when slavery was discussed the whole Congress become electrified in considering the wretchedness of that portion of humanity; and it was resolved that commerce and traffic in slaves should be forever extinguished in our republic and that the introduction of slaves into our territory should not be permitted under any pretext.

...

I beg your excellency to interpose your influence so that the Supreme Government of the Union may grant to this department exemption from the decree which abolishes slavery; or communicate to me as quickly as possible your decision concerning the action that I should take. I assure you that on my part your order shall be complied with immediately. I have only sought to point out the evils that would follow the execution of the decree in this department. I estimate that the number of slaves in the new settlements is approximately one thousand of both sexes. Their owners value them at around 300,000 pesos.

Juan Nepomuceno Seguin to Stephen Austin, July 24, 1825

The Mexican Slave Catcher

The most explosive incident involving runaway slaves in Laredo came ... on November 5, 1860. In a letter written to Henry and William Maltby's secessionist pro-slavery Corpus Christi Daily Ranchero, a forty-one-year-old Irish-born clerk named Michael Lidwell, a political ally of Santos [Benavides] who was living in Laredo at the time, said that a black man claiming to be a "free Negro" had arrived at Laredo with two dun horses and persuaded the ferryman to allow him passage to Nuevo Laredo. After the news was quickly passed along to Santos that the man was probably a runaway slave, he gathered ten vigilantes armed with rifles and pistols and at eight that evening crossed to Nuevo Laredo. "In the face of the entire population of the place," Santos was said to have "seized the negro" and succeeded in "making good his retreat [with] his men to the boat." ... Reaching the north bank of the river, the men dragged the wounded Mussett along with the runaway slave up the steep bank and scurried off to the safety of the town, where their captive was lodged in the city jail.

The Ranchero went out of its way to praise Santos for being "foremost in confronting danger in support of the laws and institutions of Texas." It was not the first time Santos had "distinguished himself in restoring runaway slaves to their owners," the Ranchero went on to say. The newspaper also praised him for his refusal to "receive any recompense for his exertions." The writers hoped that Santos, through his actions, had gone a long way toward alleviating the widely held idea in Texas that people of "Mexican origin" were not loyal to the state. His daring actions had proven that citizens on the Rio Grande frontier were as committed as the most "rabid orator." In a few comments on November 17, 1860, the Ranchero again praised Santos for daringly crossing into Mexico to retrieve the runaway slave."

Jerry D. Thompson. Tejano Tiger: José de los Santos Benavides and the Texas-Mexico Borderlands, 1823-1891. The Texas Biography Series. Fort Worth: Texas Christian University Press, 2017.

Runaways not welcome

 

Examples abound in Mexican history of laws and circulars designed to prevent the immigration or settlement of Africans in Mexico. In 1833 the Mexican consul Francisco Pizarro Martinez refused to grant immigration rights to free-blacks from Texas because in his view "'people of color' were immoral and lazy."  

In the 1920s, the Mexican ministry of the interior (gobernacion) issued a circular prohibiting African Americans in the United States from crossing the international border for even a brief visit to Mexico: "The measure prohibiting persons of the black race from immigrating to Mexico applies to the entire border in such a way that no American citizens of this race can spend even a few hours of recreation in any of the Mexican border towns."

The Mexican consul in San Antonio, perhaps in response to pressure from the NAACP, recommended to the foreign minister that citizens of la raza negra, the black race, be allowed to visit Mexico within a zone of thirteen miles along the border for a period of three days. The Foreign Ministry relented and agreed to allow black Americans to visit Mexican border cities, but reduced the time of their cross-border visits from the proposed three days to fourteen hours and stressed that they be allowed only "occasional visits."

 Foley, N., 2010. Quest for equality. Cambridge Massachusetts: Harvard University Press.