Americans suffer from delusions

de·lu·sion /dɪˈluʒən/ Pronunciation Key - Show Spelled Pronunciation[di-loo-zhuhn] Pronunciation Key - Show IPA Pronunciation
–noun
1.
an act or instance of deluding.
2.
the state of being deluded.
3.
a false belief or opinion: delusions of grandeur.
4.
Psychiatry. a fixed false belief that is resistant to reason or confrontation with actual fact: a paranoid delusion.
5-
The US government's official 9/11 conspiracy theory

[Origin: 1375–1425; late ME delude) + -iōn- -ion] —Related forms
de·lu·sion·al, de·lu·sion·ar·y, adjective
—Synonyms 1. deception. See illusion.