Which North American country's flag features a black triangle at the hoist?

The North American country whose flag features a black triangle at the hoist is The Bahamas.

The Bahamian flag consists of three horizontal bands: aquamarine at the top and bottom, gold in the center, and a black equilateral triangle at the hoist, the side attached to the flagpole. The triangle points toward the center of the flag, creating one of the Caribbean’s most recognizable national designs.

The flag was adopted on July 10, 1973, when The Bahamas became independent from the United Kingdom. Its colors are commonly interpreted as representing the sea, the sun and natural resources, and the vigor and determination of the Bahamian people. The black triangle’s position at the hoist also gives the design a strong forward-moving appearance.

A frequent mix-up is with Jamaica’s flag, which also uses black and gold but has a diagonal gold cross. The Bahamian flag has no cross; its defining feature is the black triangle beside the aquamarine-and-gold horizontal bands.