His Boring Company can build the transport infrastructure on Mars safe from the radiation and the elements of its surface but also, it will have the expertise in large scale, habitable vacuum/pressurized space, which will be a must to build Martian colonies.
He is extremely popular and is well respected as a visionary. People will definitely follow him to Mars.
Once he's establishing colonies on Mars, I don't think he'll need to be American, South African, or Canadian any more. He will be Martian, and he can build his own country there.
