They manufacture it and sell it to us. The US led solar research. China organizations certainly contributed to research as well, but they’re a much larger manufacturor than the US, despite the significant research advancement contribution by the US. US politicians failed to put any backing into domestic effects to manufacture solar and now it’s second fiddle in an industry its research helped create. So, it’s not in the stone age, because it’s paying out the ears for it while other countries profit heavily.