Well, not exactly 50 years. But today marks the 50th anniversary of the Interstate Highway System. The superhighway system sparked the need for cheap food near highway exits that began the chain-dominated fast-food revolution. It also marked the end of many home-grown places to get a bite to eat.
The chain restaurants were located on cheap land near the exits with drive-thrus so you wouldn't have to get out of the car, and bathrooms in case you did want to leave the car.
Given the impact of fast food, and that many people are still alive who remember otherwise (not me), I can't believe it's only been 50 years.