Lass title: American Art and Architecture

Each of the 5 topics are separate essays and need a reference (each) easily found online.
250 word definition of the movement listing the attributes / characteristics of a particular style on the following style.
Abstract expressionism
Pop Art
New realism/ Photo realism

Also 250 words on:
Why John Russell Pope was an influential American Architect
Why Alfred Stieglitz was an influential American Photographer