Sentence:  Of course , nationalism has really outlived its usefulness in a country as world oriented as ours , and its continued existence reflects one of the major culture lags of the twentieth century <WSD>United</WSD> States . 
Meaning of the word marked with <WSD> tags:  North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776