The main reason why the U.S. was neutral when WWI started was to avoid an expensive endeavor that would cost a high price.
The U.S. understood that taking sides would lead to them suffering trade restrictions by the opposing side.
Added to the cost of raising and maintaining an army, this would have made WWI too expensive and the U.S. did not want this.
Find out more on U.S. neutrality at https://brainly.com/question/13626382
#SPJ1