The bulldozer is a type of transportation that transports dirt, gravel, and soil. The bulldozer was invented was because the large shovel blade of a bulldozer existed before motorized vehicles and  they originally put the mules or horses on farms to move dirt. Also, the endless tractors with tread chains were invented and the crawler tractors were less likely to sink in loose soil or sand. The person who invented the bulldozer was a Kansas farmer James Cummings and a draftsman who created the blade in 1923. Their patent approved in 1925, was for a scraper blade that was mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of an tractor. The tractor to which Cummings and McLeod attached to their blade was a wheeled farm tractor. How the bulldozer changed over the years  the bulldozer became an a American icon, and the size sophistication of their machines grew, with additional automatic transmissions, hydraulic cylinders, electric motors, GPS technology, and an automatic grade control. The one thing I could improve on the bulldozer is I could add touch screen able levers to operate the shovel that’s on the Bulldozer.