The flag of the United States Virgin Islands, an unincorporated U.S. territory in the Caribbean, puts a stripped-down version of the American coat of arms on a plain white field.
Adopted four years after the transfer
The United States bought the islands from Denmark in 1917, a wartime purchase driven by the risk that Germany might otherwise take them and by their position relative to the Panama Canal. New symbols of government were needed almost immediately.
Early proposals mixed Danish and American elements. The design that won out dropped the Danish half and went with an unambiguously American emblem. Rear Admiral Sumner E. W. Kittelle, then governor of the islands, had a large hand in settling the final version, which was adopted on May 17, 1921.
Design and symbolism
The flag has a white field with a bald eagle at the center, taken from the Great Seal of the United States. The eagle holds a laurel branch in its left talon and three arrows in its right, with the striped shield of the United States on its chest. A blue "V" and "I" sit on either side of it.
The eagle is read as strength and vigilance, the laurel branch as peace, and the arrows as readiness to defend. Borrowing from the Great Seal makes the link to the mainland explicit. White signifies purity and peace, blue vigilance and truth, red valour, and gold the wealth and sunshine of the Caribbean.
How it is used
The flag is the official emblem of the territory and hangs at government buildings, schools and other public places. It is usually flown next to the U.S. flag, which is the arrangement most residents see day to day.
It turns up at official ceremonies and local celebrations, most conspicuously on Transfer Day, which marks the 1917 handover, and during Carnival. Local artists use it, and it appears in island media often enough to be part of the visual furniture.
Related flags and terminology
The bald eagle links the flag to other U.S. territorial flags, including those of Puerto Rico and Guam, and to the national flag itself. Before 1917 the islands flew Danish colors.
The vocabulary used to describe it is standard vexillology: the "field" is the white background, a "charge" is anything placed on it, and the eagle is the flag's central emblem.
References
[1] The Flag Institute
[2] North American Vexillological Association
[3] "The Flags of the World" by Whitney Smith