I believe that the Black Mesa extends into Northwest Oklahoma, namely the "Red Carpet Country" of Cimarron county in the Oklahoma Panhandle.
He became the first american playwright to recieve a nobel prize.
The Mexican Cession is the region in the modern-day southwestern United States that Mexico ceded to the U.S. in the Treaty of Guadalupe Hidalgo in 1848 after the Mexican.
I think it might be c but I could be wrong