Karina Ahumada waves a Mexican flag next to a 1964 Cadillac owned by Rene Sanchez on Brennan Street Thursday, which was Mexican Independence Day. In Mexican history, the day commemorates the moment when Father Hidalgo, a priest and leader, called for Mexico’s liberation from Spain in 1810. The holiday lands during Hispanic Heritage Month (Sept. 15—Oct. 15). Dozens of cars flooded downtown Watsonville decorated with Mexican flags.