The reason for the tariff war is because he wants more companies to come to United States. So he thinks increasing tariff of each country will help that to happen.
But it is very possible that this will fail. He has paused the tariff for each country for 90 days but he increased China tariff instead.
I don't think that the reason why trump place a tariffs on some countries is because he wants companies to come over to America because if you want companies to come and do business in your country you have to make your country conducive for these companies to thrive and in this area America has failed because they have used tax to pursue many companies out of the united states of America due to the high cost of production that the United States of America have this is the main reason why most companies go to places like China where there is low production cost.
So trump is getting it wrong what trump trump is trying to do is economic intimidation of other countries which to me he is doing a great mistake because it will definitely backfire because the world has moved above that level where only one country will bully other countries with tariffs and think that other countries will keep quit about it American citizens will be greatly affected by this trade war going on.