Can't really comment on discrimination or easiness as I'm not American, however Americans have it far more easy than most other countries to travel VISA free. Discriminatiion or not Americans have a recognized passport and save a lot of $,s not needing to apply for a Visa.
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Which countries are Visa free?
https://en.m.wikipedia.org/wiki/Visa_requirements_for_United_States_citizens
As of 1 January 2017, holders of a United States passport could travel to 174 countries and territories visa-free or with visa on arrival
And??