What do u mean by word nationalist ​

A nationalist is a person who passionately identifies with their own country and fiercely supports it's interests, often at the expense of or in opposition to the interests of other countries.

in 32-page handwritten address, washington urged americans to avoid excessive political party spirit and geographical distinctions, in foreign affairs he warned against long-term alliances with other nations. the address was printed in philladelphia's american daily advertiser on september 19, 1796