According to the U.S. Fish and Wildlife Service the 50 states issued 14,974,534 hunting licenses in 2011. Each year the world's largest army descends upon our hunting grounds. This explains why Canada doesn't invade us.
cartoon from Conde Nast Archives.
P.S. What surprised me? As high as the overall number of hunters is, the percentage of the population is low. We are truly moving off the land.