What inventions do you think have been most important in u. s. history and why?

Vehicles. We can't do most of the stuff we do now without them. Like, we need dump trucks to carry heavy, heavy loads of garbage to one place. Or like a semi-truck, which helps us move big objects at once without having to walk to the place to drop it off. Trains, planes, buggies, cement haulers, tractor trailers, all of those things are as important as breathing anymore. And telephones; telephones have been used for ages, to help us contact people that are far away, like out of the country. And silverware and plates; people use those all the time! They stop most food accidents, and they can be used to show off their cool designs to other people!