The Pan-Slavic colours, red, blue and white, are colours used on the flags of most Slavic states and peoples. Their use symbolizes the common origin of the Slavic peoples.
The origin of these colors is in the Pan-Slavic movement of the 19th century Europe.
The flag of Bulgaria also originated from the same Pan-Slavic colours, but the blue was replaced with green, because Bulgaria was developed as an agricultural country after its independence in 1878. The flag of Eastern Rumelia, a former Turkish province now part of Bulgaria, also consisted of the same colours.
The flag of Montenegro also used to consist of the same colours (in the same order as in the flag of Serbia, but with a brighter hue of blue) until it was changed in 2004.
These three colours are, without the same symbolism, also used on the flags of many non-Slavic nations, including the United States, the United Kingdom, and France.
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