The Pinkerton detective agency uncovers a plot to assassinate President James Garfield in 1881 Texas. The film, a "political" Spaghetti, is a very overt mirroring of the JFK Assassination in 1963.
On arrival at the station in Dallas, the President's wife is given some red roses. The same thing happened to Jackie Kennedy on arrival at Love Field for President Kennedy's visit to Dallas. They should have been yellow, to commemorate "The Yellow Rose of Texas", but all the yellow roses had already been placed at the Trade Mart, where JFK was due to speak, and only red ones were available.
President James Garfield:
I could never feel like the President of the United States if I couldn't visit freely ALL of those United States.