You can build a manufacturing base, but can you also "build" the workforce willing to work for manufacturing sector wages while keeping the prices competitive?
China hasn't been a low-wage country since 2016. They're able to continue to build cheaply because they built an efficient and comprehensive supply chain with increasing levels of automation and robotization. BYD factories are full of robots.
1. Wages in the US are still way higher than China.
2. Cost of manufacturing something is much more than just raw workers' wages. There's environmental regulations and protections as well, insurances, taxes, pension contributions, etc all being significantly less in China than the US or the west.
Especially the environmental part. Also work accidents. If a worker in China looses a thumb, it's no biggie, If a worker in the US does, he'll sue and win a 6 figure payout.
All these make manufacturing in the US much more expensive even if wages were to be the same.