From 1866 to 1889, drovers and beeves on the Chisholm Trail, a cattle trail established in 1866, stirred up the dust and stench, rumbling through Yukon. Running from Texas to Abilene, Kansas, the trail passed through today's Yukon City Park. Drovers kept their eyes peeled for the park's five-acre Mulvey Pond, because it was the last spring-fed watering hole before reaching Abilene, and it was the last guaranteed water as they meandered through Indian Territory. Those buckaroos and herds navigated both the Canadian River, just south of Yukon, as well as the North Canadian River on which Yukon is perched.
In 1890, federal law split Indian Territory into the Twin Territories with Oklahoma Territory in the west, and Indian Territory relegated to the eastern half. Both sides prepared for statehood.
Through five land runs, and other means, Euro-American settlers claimed land in Oklahoma Territory. Yukon sat in the so-called "Unassigned Lands," and thus was opened to settlement via the Land Run of 1889. Settlers claimed their Yukon lands, and settled in, building their homes and farming their homesteads. (Not all of Canadian County opened via the 1889 land run.)
As Texas cattle ranchers, cowboys, and entrepreneurs, the Spencer brothers, Augustus "A.N." Spencer and Lewis "L.M." Spencer, noticed today's Yukon area while driving their herds on the Chisholm Trail. Both men invested themselves in Indian Territory's railroads, and they became cattle ranchers in Texas, riding up and down the Chisholm Trail with their herds. A.N. Spencer also had cattle in New Mexico and Kansas.