Why was the mass production of military vehicles and ships a key factor in the country's war effort?

The mass production of vehicles and ships was a key factor in the country's war effort because these means of transportation were crucial in order to achieve victory. ... American production companies made sure these ships and vehicles were easy and quick to produce which helped keep up with the increasingly high demand.

they wanted the u.s. to fight on the side of the central powers.

i believe it is the second one.   if correct plz mark brainliest.