Which latin american country celebrate its independence day on september 16

Mexico celebrates its Independence Day on September 16.

Strange as it may seem, the people of Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua might not notice the celebrations in Mexico, because THEIR independence was just the day before ... all in 1821 .  (It was not a good year for Spain.)

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)

i think the reason that they immagrated was to find freedom of religion