Sentence:  While there may be several such industries to which the model of this paper is applicable , the authors make particular claim of relevance to the explanation of the course of wages and prices in the steel industry of the <WSD>United</WSD> States since World War 2 , . 
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