There is a single flag matching these criteria: Flag of Maine.
Green in Flags
Green commonly symbolizes nature, agriculture, and fertility in flag design. It is especially prominent in African nations, where it represents the land and natural resources, and in Islamic countries, where it is associated with faith. Green conveys life, renewal, and hope, making it a powerful color for national identity. Countries like Nigeria, Brazil, and Saudi Arabia showcase green prominently in their flags.
White in Flags
White traditionally stands for peace, purity, and honesty in flag symbolism. It is used either as a background or in combination with other colors to balance a design. The Japanese flag highlights purity and simplicity with its white field. Many nations use white to symbolize peaceful intentions or unity, including Switzerland and Finland. Its neutral quality makes white a foundational element in countless flag designs.
Brown in Flags
Brown is one of the least used colors in flag design. When included, it typically symbolizes the earth, land, or indigenous heritage. Brown conveys stability, tradition, and connection to the soil. A notable example is the flag of Belize, which includes brown in its national coat of arms to represent workers and natural resources. Though uncommon, brown adds a grounded, earthy quality to flag symbolism.
