In 1825, he served as president of the Congreso Constituyente of the state of Coahuila y Tejas, counselor to governor Victor Blanco,[1] and as the arbitrator in a feud between the Sánchez Navarro and Elizondo families.
[3] In 1832, the Mexican government canceled Milam's grant due to an insufficient supply of new citizens for their colony in Texas, following a new law passed in 1830.
[2] In 1835, Samuel May Williams acquired ten leagues (about 44,000 acres (18,000 ha)) of the grant from Del Valle and sold the land to Michel Branamour Menard, who established the town that would become the present-day Galveston, Texas.
[6] Del Valle sold the remaining league of the grant, a swath of land south of Bastrop, Texas, to Bartlett Sims.
[7] In Southeast Austin, much of McKinney's portion of the Del Valle grant was sold to plantation owners such as Albert Clinton Horton and Judge Sebron G. Sneed; both homesteads still remain.