If you cant build your product because a component you relied upon is now 25% more expensive, you're continued existence is predicated on having deep reserves. Many smaller companies don't and even the larger ones will have to implement deep layoffs relatively quickly to conserve resources as they won't know how long the trade war will last.
This in turn will have an effect on the political situations in both countries although primarily America as its the democracy. Globalization and the economic relationships amongst nations now has a direct effect on the internal politics of those same states.