On 10 February 2011, the Arizona Republic's "On This Day In Arizona History" reported that in "1857 Hadji Ali arrived in the United States" with his camels. Interestingly, the plaque at the Hi Jolly Monument in Quartzsite, Arizona, says: "Came to this country February 10 1856." Damn off-by-one errors.
P.S. When in Quartzsite, be sure to get your buns into the Quartzsite Bakery...
On 10 February 2013, the Arizona Republic's "This Date In Arizona History" again reported that Hi Jolly did his thing in 1857.