Ford, founded in 1903, and GM, which came along nine years later, have been warring for 101 years. The epitome of crosstown rivals -- their headquarters are just 11.5 miles apart -- they face off every day on dealer lots and in motor sports. Both maintain operations to scour the other's new products.
In 2011, Ford marketing chief Jim Farley was quoted as having said, "I hate them and what they stand for." Meanwhile, GM chairman and CEO Dan Akerson recommended sprinkling holy water on ailing Ford luxury brand Lincoln. "It's over!"
--Alex Taylor III
Seven tales of competition that changed business forever. Available free to subscribers on Fortune's tablet apps.