Colorado became a U.S. state in 1876 . Cinco de Mayo commemorates the 1862 Battle of Puebla . Much of the Southwestern U.S. was once part of Mexico . The Mexican government has said it will not pay for a border wall with the United States and is instead working to improve relations between its two neighbors. Old Town San Diego is hosting Fiesta Cinco de Mayo this weekend .
Cinco de Mayo commemorates the 1862 Battle of Puebla . Much of the Southwestern U.S. was once part of Mexico . The Mexican government has said it will not pay for a border wall with the United States and is instead working to improve relations between its two neighbors. Old Town San Diego is hosting Fiesta Cinco de Mayo this weekend .