What will happen if we do get in a big trade war with China?

Problem is it's more expensive buying anything American made than it is to buy Chinese made. For now at least !
Same with Indian or Taiwanese produced goods.

That means fewer folk buy American. No jobs created (quite possibly lost if U.S.sales dip far enough !)
That sends America into recession which in turn affects the rest of the world since so many economies are aligned with America's.

Walmart is not your problem. Most of the engineered and electronic components in everything you consider US made is sourced in China, like Ford and GM cars, fridges and major appliances. Prices on pretty much everything will go up. On Chinas hit list are crops like Soy beans, which they can buy elsewhere from friendlier countries who will be happy to have the trade. So jobs will start going all over.. From farm workers. to Truckers and small town businesses who need them to live. And the US doesn't have the cash to go buy on the world stage any more.. You need to deal with people who will take your IOUs , like oh... China?

Anyone who takes on China is going to have to have citizens willing to work much harder for less money. We can't be competitive otherwise. Also, the quality of products coming from China is now starting to move beyond anything we can do. I bought a wireless keyboard that works perfectly well, and cost less than £5 (including the shipping costs from China). That means it's probably cost them about 35 to 50p to make it. The West just can't do that.

I like your thinkin', Tasty! But China will win. And prices wouldn't have to go up in America if the fat cats on top would take less. And that ain't gonna happen either.

we meaning who?

Less cheap tat that breaks after 5 minutes