Sentence:  As used in this Act , the term ' saline water ' includes sea water , brackish water , and other mineralized or chemically charged water , and the term ' United States ' extends to and includes the District of Columbia , the <WSD>Commonwealth</WSD> of Puerto Rico , and the territories and possessions of the United States . 
Meaning of the word marked with <WSD> tags:  the official name of some states in the United States (Massachusetts and Pennsylvania and Virginia and Kentucky) and associated territories (Puerto Rico)