Flags

American Laser Skincare was created in 2002.

American Songwriter was created in 1984.

Flag of Novosibirsk Oblast was created in 2003.

The Promise of American Life was created in 1909.

American Board of Opticianry was created in 1979.

Flag of Nagorno-Karabakh Republic was created in 1992.

American Public Media was created in 2004.

Red Stripe was created in 1928.

American Guerrilla in the Philippines was created on 1950-11-08.

American Motorcyclist was created in 1947.

The American School of Marrakech was created in 1995.

American Capitalism was created in 1952.

Flag of Montserrat was created in 1909.

American Association of Woodturners was created in 1986.

American Notes was created on 1842-10-19.

The Coming American Renaissance was created in 1996.

American Look was created in 1969.

The American Scene was created on 30-01-19.

Flag of Syria was created in 1980.

Flag of Middlesex was created in 1909.

American badger was created in 1778.

American Megatrends was created in 1985.

American Leak Detection was created in 1974.

Chile's flag features blue, white, and red colors, symbolizing various aspects of the nation's identity. The blue represents the sky and the Pacific Ocean, the white symbolizes the snow-covered Andes Mountains, and the red stands for the blood shed by those who fought for Chile's independence. The white star in the blue square also signifies a guide to progress and honor for the country.

"A mailbox" fits. I don't know if it's what the person who invented the riddle had in mind or not.