In the late 1940s and early 1950s, in the United States, there was a conspiracy by Standard Oil, General Motors, and Firestone Rubber. They formed a company called National City Lines to buy streetcar systems, tear up the tracks, and replace them with buses in almost all the cities in North America. They did this so they could make bigger profits by selling more oil, buses, cars and rubber tires. Because of this, it was necessary to spend hundreds of millions of dollars of public funds in the 1980s and 1990s to reconstruct the streetcar systems as light rail systems using light rail vehicles. This conspiracy is somewhat referred to in the 1988 film Who Framed Roger Rabbit.