It is almost possible to tell the history of Silicon Valley by looking only at investments made by two firms: Sequoia Capital and Kleiner Perkins.  Both firms were founded in 1972. Both firms went on to shape how millions of people lived and interacted with technology around the world.  Sequoia was set up by the late Don Valentine who made his first investment in Atari, a pioneer in home gaming. In 1978 Sequoia invested $150,000 in a tiny company founded by Steve Jobs and Steve Wozniak called Apple.  In 1983 it invested in Larry Elison, a double college dropout, who…