With the arrival of the twentieth century, Americans continued in the pioneering spirit of their forebears and looked upon the automobile as a new way to explore the unknown. Thousands of Americans packed their tents in the backs of their cars and set out to enjoy the back roads of the United States. Carrying extra gasoline in five-gallon cans, plenty of canned food, and extra tires strapped to the fenders, these intrepid souls began an exploration of the North American continent with a thoroughness that put Lewis and Clark to shame. These tourists became the symbol of another "New...