In 2025, > 90% of new energy capacity built in the US is from renewable [0]. So the US isn't building that much solar not because they're not building solar, but that the US has been generating and consuming so much energy per capita that there isn't that much incentive to increase energy capacity dramatically.
[0]: https://www.canarymedia.com/articles/clean-energy/us-new-win...
These are new electric power plants. The US is still ramping up oil and gas production, and is now producing more than ever before. No signs of transitioning away from fossil fuels for transport, industry, export.
https://www.canarymedia.com/articles/fossil-fuels/chart-the-...
The US has done well historically, roughly on par with China on per capita renewable rollout, slightly ahead of China between 2019-2023 but probably falling behind now.
China being so big and populous makes it hard to make simple comparisons.
edit: looked it up, US is still ahead of China as of 2024:
https://ourworldindata.org/grapher/renewable-electricity-per...
Bear in mind that pre 2000 is likely hydro, in the early years of solar and wind that confused matters if lumped in together but I think it's now obvious when the new tech kicks in.