We've been asked that question nearly everyday for over 15 years.
China builds more diesel engines than the rest of the world combined.
China builds more tractors than North America, South America, and Europe combined. The Chinese have been building diesel tractors for more than fifty years. Chinese tractors are sold on every continent and in nearly every country. You can find them plowing fields in Australia, powering irrigation pumps in Egypt, providing electricity for remote villages in Alaska, spraying vegetables in Brazil, planting wheat in Spain, and mowing grass in Mississippi. The fact that these tractors are built in China is the BEST thing about them.