Was at AU a month ago and the campus was in excellent shape. The buildings aren’t always conventionally “collegiate” (as far as looks go, some may have the same architect as the FBI building’s 
) but it’s a very nice campus, large enough not to feel crowded/large enough to make you walk about, but compact enough that you can walk to class.
Oxy will be more liberal and more theoretical - readings, discussions, all the traditional intellectual college work with a strong political bend. IMHO Oxy is more of a “bubble” than AU, which can be good for undergrads sharpening their thinking.
American will have a variety of liberals, including “would-be republicans turned off by Trump but fiscally conservative” - but most will be into public policy and PPE matters, even those interested in Computational or Data science (they even created a double major between SIS and CAS mixing prelaw and CS). Informed discussions would be a given but quickly driven by experience (Internships would be big. )
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