What did most americans understand before their country entered world war i? that the war would not last long that the war would cost american lives that the war would the us economy that the war could be won by the us alone

The correct answer is that the war would cost American lives.

Whenever the United States enters a war, there is also the risk of losing soldiers who are fighting over seas. This is general knowledge for most Americans, as they understand that the individuals who enroll in these services due run the risk of having to fight in potentially dangerous situations. This was no different during World War I, as this situation became a reality for thousands of soldiers.

on my last question

how did the great awakening contribute to the develpment of the united states