>>25518519
depends if its an export or an import tarriff, you will either pay more to use american services and import american goods, or you europeans will find your services costing american consumers more (i.e. less competative) and your goods will cost american consumers more to buy
if the former (export tarriff) then this may cause you europeans to rely more on other countries or your own domestic providers, and if its the latter then you europeans will need to find other markets to sell to