Flags of the U.S. states and territories

The flags of the U.S. states, territories, and the District of Columbia exhibit a variety of regional influences and local histories, as well as different styles and design principles. Nonetheless, the majority of the states' flags share the same design pattern consisting of the state seal superimposed on a monochrome background, commonly a shade of blue. Some may be underway to lead some change.
The most recently adopted state flag is that of Mississippi, adopted on January 11, 2021, while the most recently adopted territorial flag is that of the Northern Mariana Islands, adopted on July 1, 1985.
History.
Modern U.S. state flags as contemporarily understood date from the turn of the 20th century, when states wanted to have distinctive symbols at the 1893 World's Columbian Exposition in Chicago, Illinois. Most U.S. state flags were designed and adopted between 1893 and World War I.
According to a 2001 survey by the North American Vexillological Association, New Mexico has the best-designed flag of any U.S. state, U.S. territory, or Canadian province, while Georgia's state flag was rated the worst design (Georgia adopted a new flag in 2003; Nebraska's state flag, whose design was rated second worst, remains in use to date).
Current federal district flag.
This is the current flag of the District of Columbia.
Current territory flags.
These are the current official flags of the five permanently-inhabited territories of the United States. Dates in parenthesis denote when the territory's current flag was adopted by its respective political body.
Current state ensigns.
Maine and Massachusetts have ensigns for use at sea.
Native American flags.
Native Americans have tribal sovereignty, with Indian nations having jurisdiction over their members and Indian reservations. Although reservations are on state land, the laws of the state(s) do not necessarily apply on tribal land. Below are the flags of some of the largest Indian tribes reservations by population and area:
Unofficial flags of atolls, reefs, and other islands.
The U.S. national flag is the official flag for all islands, atolls, and reefs composing the United States Minor Outlying Islands. However, unofficial flags are sometimes used to represent some of the insular areas in the U.S. Minor Outlying Islands: