Sentence:  Be it enacted by the Senate and House of Representatives of the <WSD>United</WSD> States of America in Congress assembled , That the Secretary of the Interior is hereby authorized and directed to make or cause to be made a study covering - 
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