Usa is weapons producer one of the biggest.
Europe want to buy from usaeurope need to buy dollars first ? But what the usa will do it with so much euros ?
Euro dont export that much that some country will euro currency from usa ?
Why don't you spend 5 seconds searching with google rather asking yourself stupid questions?
The EU is one of America’s largest trading partners, accounting for $658 billion worth of goods trade in 2020. While the U.S. exported $237.9 billion worth of goods from the EU, imports from the EU. amounted to $420.1 billion, making the trade deficit $182.1 billion, the highest ever on record, according to the U.S. Census Bureau
The US has a trade deficit with the EU, not the other way around, so now, even if trade would work the way your;e picturing with companies buying and stockpiling it before doing trade, the US will not have an excedent of Euros. Furthermore, none of the EU countries are in the top 10 destinations for US weapons, and all of the major countries in Europe are also weapons exporters of their own.