Sentence:  This is n't surprising when we consider that over 29 percent of the 11 - year old boys in <WSD>America</WSD> cannot chin themselves once , and that English school girls outdo them in almost every test ( even dashes and endurance ) . 
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