What is the meaning of -ense?

used to create adjectives and nouns that denote ethnonyms, like parmense, from Parma or statunitense, from Stati Uniti

nominative/accusative/vocative neuter singular of -ēnsis

forms the names of residents or inhabitants of a place

forms adjectives meaning “of or relating to [the suffixed place]

forms adjectives and nouns that denote ethnonyms, like estadounidense, from Estados Unidos

Source: wiktionary.org