The American cultural identity

How/Why has a "Modern" Person/Group/Phenomenon affected the American cultural identity?
Paper details:

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.