Question: The largest county in Oklahoma by area, gets its name from the broad rolling hills and rolling tallgrass prairie and Cross Timbers encompassing the county and surrounding areas, including portions of Mayes, Tulsa, Washington and Kay Counties, was created in what year?
Sentence (from "Osage County, Oklahoma"): Created in 1907 when Oklahoma was admitted as a state, the county is named for and is home to the federally recognized Osage Nation.
Relevant evidence: Yes