"It is the world's largest technology manufacturer and service provider. While headquartered in Taiwan, the company is the largest private employer in the People's Republic of China and one of the largest employers worldwide."
https://en.wikipedia.org/wiki/Foxconn
And that doesn't count all the companies that make the subassemblies and parts for Foxconn either.
http://www.mobilecellphonerepairing.com/top-mobile-phone-man...
In a trade war, those phones won’t be making it to the US.
I don't think a loss of value to the tune of $2.5T would go well for the US economy.
I don't think either country cares much about unemployment, but the US, at least, has a history of going to great lengths to maintain the value of its assets.
And I'm sure there are companies eagerly awaiting to get the business Foxconn turned down because Apple outbid them or made favorable agreements.
US GDP is $21,000B.
Losing 2% would hurt but it wouldn’t cripple the US.