Middle easterns are Caucasian??
I never really lived in a western country yet to know, but from my relatives or friends I heard that socially everyone treats Middle Eastern people as people of color but while filling out forms and stuff sometimes they check white/Caucasian.
Under the U.S. Census definition and U.S. federal agency,
individuals with ancestry from North Africa are considered white. The Equal Employment Opportunity Commission regulations also explicitly define white as "original peoples of Europe, North Africa, or the Middle East."
Source