Houston — Historians agree they cannot remember a strike by workers at a hotel in Texas. “This does set a precedent,” said Thomas Alter, professor of U.S. and Texas history at Texas State University. The striking Hilton workers, represented by UNITE HERE Local 23, walked out on Labor Day, asking for higher wages and better working conditions. It was to have been a 10-day strike, but the workers voted to extend their strike to Sept. 20. UNITE HERE International President Gwen Mills called the Hilton strike “truly historic for the hospitality industry in Texas” and said other union locals are watching.