There aren't too many places in the world where you'll see American-style conventional tractors used. Canada, Mexico, a few South American countries, Australia , and some countries in Southern Africa, and that's about it, with the two largest customers being countries for whom new tractors would be shipped and exported, and the rest hardly being enough to dry up the supply of used tractor sales in the US. You can probably find more tractors on the road in a state like California than in all of southern Africa or South America.