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 <WSD>District</WSD> of Columbia , the Commonwealth of Puerto Rico , and the territories and possessions of the United States . 
Meaning of the word marked with <WSD> tags:  the district occupied entirely by the city of Washington; chosen by George Washington as the site of the capital of the United States and created out of land ceded by Maryland and Virginia