How/Why has a “Modern” Person/Group/Phenomenon affected the American cultural identity?

Automobile Design & Technology Environ Concerns Fashion Film Food Gov. & Politics Inventions Media Music Person (cultural icon) Philosophy Popular Culture Religion Science Tech. Engineering Math Social Movements Theater Traditions Violence War.(Possible topics not exhaustive).Modern is like 50 years ago, It’s your standard 5 paragraph essay with intro and conclusion. Three evidence each.And also 10 sources somehow.