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
John Jacob Astor IV patented several inventions, including a bicycle brake in 1898, a "vibratory disintegrator" used to produce gas from peat moss, and a pneumatic road-improver, and he helped develop a turbine engine. Like generations of Astors before him, he also made millions in real estate. In 1897, Astor built the Astoria Hotel, "the world's most luxurious hotel", in New York City, adjoining the Waldorf Hotel owned by Astor's cousin and rival, William. The complex became known as the Waldorf-Astoria Hotel. The Waldorf-Astoria would later be the host location to the U.S. inquiries into the sinking of the RMS "Titanic", on which Astor