"La juventud Guatemalteca participa a las democracias del mundo, el nacimiento de su anhelada libertad".

This footage is from the time of the coming to power of Juan Jose Arevalo in 1944 in Guatemala. I think this clip was originally posted by Guatemalan time lapse website - Guatemala: Jugando con el Tiempo. Interesting is the choice of music this clip is set to, somehow slightly bizarrely Radiohead's Sail to the Moon seems to add to its poignancy. Don't know what the exact date is, but it looks like parts of this are clips from a typical 15th September celebration...