Economic benefits

Economic benefits.

• The USA was one of the only involved countries that were not completely devasted by the effects of World War 1. 

1.  US companies were able to expand to expand their reach around the world. Domestic US consumption increased as well, hence the name of the upcoming "roaring twenties."
2.  The US economy did slightly drop after peace was made once the war was over. But, again, they were the only country that wasn't in ruin, so were able to take advantage of this economic superiority.
3.  Countries with damaged industries bought American goods, making good use of American loans.

The US exported food and weapons the European countries during the war. Although they joined the allies towards the war's end no fighting happened on American soil.

So, the effects - which were mostly short-term (great depression was to come) were that the US economy was able to grow a lot due to how they involved themselves in the war and the position they were left in afterwards.