This week I am creating slides for a presentation I am giving in California later this month. While researching the material, I took a closer look at the history of California’s oil industry. California’s Historical Importance Many people are unaware of California’s importance in the U.S. oil industry. In fact, 100 years ago California was the top oil producer in the U.S., responsible at one point for nearly 40 percent of U.S. oil production. California’s oil production rose throughout most of the 20th century,…