Maybe things like prosciutto cotto (ham) or salamino piccante ("peperoni") ?
> Greek-Canadian Sam Panopoulos claimed that he created the first Hawaiian pizza at the Satellite Restaurant in Chatham, Ontario, Canada in 1962.
[0] https://en.wikipedia.org/wiki/Hawaiian_pizza
Not the US, but from the Americas.
Maybe things like prosciutto cotto (ham) or salamino piccante ("peperoni") ?