Where in the world?
The flag of the United States has thirteen horizontal stripes of red and white with a blue rectangle in the top left corner containing fifty white stars.

United States of America

United States

Population: 329,484,123

Region: Americas

Subregion: Northern America

Capital: Washington, D.C.

Top Level Domain: .us

Currencies: United States dollar

Border countries

The flag of Canada has a red field with a white square in the center, featuring a red maple leaf.

Canada

Population: 38,005,238

Region: Americas

Capital: Ottawa
The flag of Mexico has three vertical stripes of green, white, and red, with the national coat of arms centered in the white stripe.

Mexico

Population: 128,932,753

Region: Americas

Capital: Mexico City