Yes America needs to do this because the manufacturing capacity of allies in Korea, Japan, and Taiwan is under threat by China.

America is the only country with the military capacity to take on China, and Europe isn't going to get up to speed in time to defend Taiwan.

It must be America out of necessity not preference.

Great, but as I said, it does not make sense for the US to chase low value manufacturing.

Apparel, shoes, things you might find in a big box store -- zero sense. Low value manufacturing - leave it to China, Vietnam, India.

Jet engines? Advanced polymer materials? Batteries? All make sense! CHIPS act was intended to accelerate US IC R&D and manufacturing...which was cancelled.

In an impending war with China who will manufacture the ammunition needed to win the war?

And the boots, the uniforms, the helmets?

You're assuming that China is manufacturing the ammo being used by the US armed forces? Gonna need some receipts.

You misunderstand.

I am concerned that the United States does not have the industrial capacity or institutional knowledge to make relatively simple but essential things for war.

In a protracted conflict with China will the US have the industrial capacity to produce enough ammunition? Does the US have a sufficient stockpile of ammunition to buy enough time to scale up the industrial capacity to manufacture more ammunition? Are there enough skilled people in the US who can teach more people to become skilled in this endeavour in time?

Does the US even have enough industrial capacity to produce enough iron, aluminum, nickel, copper and other such things to do this?