The noun insularity means the quality of being interested in your own country or group and not willing to accept different or foreign ideas.

Synonyms are accelerate, hasten, promote, or speed.

The word origins in 1755. It is derived from insular meaning “narrowness of feelings” plus –ity. The sense of “state of being an island” was attested from 1784.

They need to stop their old insularity and be open-minded.

He believed that the insularity of his countrymen is the result of ignorance of all law and institutions.

The tribe was not very good at making conversation with other people because of their insularity.