Why do Americans insist on saying they're American-Italian, American-Irish, etc. - when 95% of them know nothing about being Italian, Irish, etc?

SakuraBlossoms87

As someone European born it's always been a curiosity.

Why do Americans insist on calling themselves American something when 95% or more of the time they don't know little or more often than not pretty much nothing about the culture, history, or even cuisine about the ethnicity they claim themselves as.

Why do Americans insist on saying they're American-Italian, American-Irish, etc. - when 95% of them know nothing about being Italian, Irish, etc?
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