He created it whilst Secretary of War for Pearce, how can we have it survive?
Basically you have to somehow derail the Civil War. The camel experiment was actually quite successful...enough so that Jefferson Davis's successor as Sec. of War asked Congress for funds to purchase another 1,000 of them...but it came on the eve of the outbreak of the war. The needs of the war, plus the fact that Jefferson Davis became President of the CSA, thus tainting the camel experiment by association, caused the War Department to abandon the idea. No further camels were purchased.
There was local opposition in Texas and the southwest to the idea, as well, mainly from horse traders who thought camels would put them out of business and who waged a media campaign against them in local newspapers. Many people also objected to camels on the grounds that they didn't get along well with horses, and were stubborn and aggressive. When the war came, most of the camels were in Texas, and they were seized by the State government, who turned them over to the Confederate government. The Confederates did make limited use of them during the war, but the opposition within Texas was too strong, and they mostly sat unused. When the war ended, the U.S. War Department seized them again and then, in 1866, sold them off to circuses, zoos, and private individuals.
But I think the local opposition could have been defeated if the Civil War had been derailed somehow. If Davis and his successor had been successful in getting funds to purchase 1,000 camels, a viable population could have been established and, in time, regiments of camelry could have been formed which would have been very useful in the southwest against the Apaches. We might well see one or two of these survive to even fight in North Africa during World War II, conducting daring raids on German installations, going where vehicles would never dare to go.