There will be one of three outcomes of the tariffs depending on the nation. 1- The nation will reduce or remove its tariffs on US products. That's a win for everyone. 2- The nation will not remove or reduce tariffs and rational businessmen will move production to the US or, if they don't, goods from that country will become more costly. That's a win for the US. 3- A nation might, really its leaders, might decide that they are a bigger dog than the US and begin a trade war. That would be bad.. but likely short term. The US is by far the largest market in the world. Other nations need access to US markets more than the US needs access to their markets.