When was the term nationalism first used?
Nationalism
1844
Nationalism as derived from the noun designating 'nations' is a newer word; in English the term dates from 1844, although the concept is older.[17] It became important in the 19th century.[18] The term increasingly became negative in its connotations after 1914.  Glenda Sluga notes that "The twentieth century, a time of profound disillusionment with nationalism, was also the great age of globalism."[19]