[rfrec0n]

There are no examples in the past 40 or 50 years. The country is infested with illegal monopolies. At this point there really aren't any industries left that aren't completely dominated by 3 or 4 massive companies. This has even spread to industries which have been historically immune to monopolies for various reasons, such as local news, FM radio, primary care practicianers, hardware stores, textbook publishing, car/heavy equipment mechanics, etc.