Modern urban communities are knit together by transportation arteries. Some of these arteries are rail. Some are roads. Urban communities on rivers, lakes and oceans have the added advantage of waterways to provide connectivity. But the vehicle most responsible for modern North Americ

The 20th century was the age of the internal combustion engine just as the 19th was the age of steam. Humanity went from horse and buggy, sail and balloons to the development of railway networks, automobiles, engine-driven ships, airplanes and rockets. The world became a lot smaller p