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The national flag of Afghanistan (Dari Persian: پرچم افغانستان, Pashto: افغانستان توغ) consists of a vertical tricolor with the classical National Emblem in the center. The current flag was adopted on August 19, 2013, but many similar designs had been in use throughout most of the 20th century. Afghanistan has had 25 flags since the first flag when the Hotak dynasty was established in 1709. During the 20th century alone, Afghanistan went through 18 national flags, more than any other country during that time period, and most of them had the colors black, red, and green on them. Along with Haiti, Bolivia, Costa Rica, the Dominican Republic, Ecuador, El Salvador, and Venezuela, it is one of eight national flags whose design incorporates a depiction of the flag itself. It is also, along with Bolivia, Cambodia, Portugal, San Marino, and Spain, one of only six national flags that feature a building.

Source: Wikipedia