If Zachary Taylor hadn’t gotten gastroenteritis, New Mexico could have become a state 62 years sooner.
On June 20, 1850, New Mexicans ratified a free-state constitution by a vote of 8,371 to 39.
Taylor immediately called for New Mexico’s admission along with California’s; southern outrage flared to new heights; and the state of Texas vowed to secure its claims to all of New Mexico east of the Rio Grande, by force if necessary. Taylor ordered the federal garrison at Santa Fe to prepare for combat. By early July, it looked as if civil war might break out, pitting the United States against southern volunteers determined to secure greater Texas for slavery. (The Rise of American Democracy)
Taylor died July 9. Fillmore became president and defused the situation by laying aside New Mexico’s application for statehood.
The resolution came as part of the Compromise of 1850 in September. The boundaries of Texas were established as we know them (poor surveying and a meandering Rio Grande notwithstanding). In return, Texas received $10 million in compensation applied toward its debt (worth about $200 million today). The bill also established the territories of New Mexico (which included present-day Arizona) and Utah (which included present-day Nevada and western Colorado). The issue of slavery in those territories was ignored — for then.