do Americans have a culture?

do Americans have a culture?my teacher said americans dont have a culture. I mean their own culture something they created. or is that considered to be made by the British because they colonized the area? I thought they do, but I may be wrong. america has a history with cowboys and native Americans even though america was settled by the British people have created things that are unique and not have been created anywhere else.native Americans have their own style of dress same with cowboys.