1920) is used in Andean indigenism in Peru and Bolivia to represent the legacy of the Inca Empire. The International Co-operative Alliance adopted a rainbow flag in 1925. Ĭontemporary international uses of a rainbow flag dates to the beginning of the 20th century. In the 18th century, American Revolutionary War writer Thomas Paine proposed that a rainbow flag be used as a maritime flag to signify neutral ships in time of war.

2 Rainbow flags in various cultures and movements.