Waldorf, Maryland General Assembly of Maryland by an act changed the name to "Waldorf" in honor of William Waldorf Astor (1848–1919), the great-grandson of John Jacob Astor (1763–1848), who was born in Walldorf, Palatinate, Germany. On July 29, 1908, the city of Plumb Valley in Waseca County, Minnesota, changed its name to Waldorf after Waldorf, Maryland. Once a tobacco market village, Waldorf came to prominence in the 1950s as a gambling destination after slot machines were legalized in Charles County in 1949. The boom lasted until 1968 when gambling was once again outlawed. Its subsequent substantial growth as a residential community began
William Waldorf Astor in the United States. In 1882, President Chester A. Arthur appointed Astor Minister to Italy, a post he held until 1885. He told Astor, "Go and enjoy yourself, my dear boy." While living in Rome, Astor developed a lifelong passion for art and sculpture. Upon the death of his father in February 1890, Astor inherited a personal fortune that made him the richest man in America. That year, he initiated construction of the luxurious Waldorf Hotel, being built on the site of his former residence. His cousin and rival Colonel John Jacob "Jack" Astor IV (1864–1912) built the adjoining Astoria