From space travel to military operations to the future of green energy, the U.S. has become reliant on Elon Musk's business empire. But it won't be easy for the government to end its reliance on Musk.

Elon Musk's departure from the Trump administration means investors will hope he refocuses on his sprawling empire. Now what?

The activists behind the Tesla Takedown campaign say they intend to expand beyond protests at the company’s showrooms.