The United Auto Workers (UAW) union has launched a targeted strike at three factories in the US, affecting Detroit's "Big Three" automakers for the first time. The strike came after failed negotiations between the UAW and General Motors, Ford, and Stellantis. Approximately 12,700 workers are participating in the strike, which could be expanded if demands are not met. The UAW is seeking a 40% wage increase and better benefits for its members. The strike poses a challenge for President Joe Biden, who has sought support from organized labor.