Like the high seas, vehicles in space are required to register as property of their native country. As registered property of the United States, spaceships would fall under the territorial jurisdiction of the US government. In fact, all vessels of the United States fall under the government’s legal jurisdiction. According to Title 18 of the US Code of Laws, “vessel” includes any object owned directly by the United States, by a US citizen, and by any corporation created in the United States or any territory, district, or possession of the United States. So even if you manage to create your own rocket company on par with SpaceX, you’d still be subjected to all US laws from take off to landing.