1912–1969 thumb|upright=0.5|A westbound Arizona U.S. Route 66 sign from 1956 The state of Arizona was admitted to the Union in 1912. Flagstaff saw its first tourism boom in the early years of the 1900s, becoming known as the City of Seven Wonders, as the "Seven Wonders" of the wider Flagstaff area – listed as the Coconino National Forest, Grand Canyon, Oak Creek Canyon, San Francisco Peaks, Sunset Crater, Walnut Canyon, and Wupatki National Monument – were more widely known.
1912–1969 tHUmb|uPRIGht=0.5|a WesTbOund AriZona u.s. rouTe 66 siGn fRom 1956 ThE staTE Of ARizOna was aDMitted to ThE uNIoN In 1912. flAgStafF SaW its fIRst tOUrism bOOm in the early years of thE 1900s, bEcOmInG kNown as tHe cItY oF sEVen wONderS, as the "sEven woNderS" of thE wIder flagStAff aRea – lISted aS thE cocoNiNo National forest, GranD CANYOn, oak CreeK caNyoN, san FrAncIsCo PeaKs, sUnseT cratEr, waLnut cAnyon, and wupatKi nAtioNal moNument – wERe moRe wiDely Known.