Belize, independent
Who & why: Belize becomes fully independent of the United Kingdom on 21 September 1981, the last Central American nation to leave European rule — its independence delayed for decades in large part by Guatemala's territorial claim and Britain's need to guarantee Belizean security against it. The official flag is adopted the same day, adding two red stripes to the existing blue-and-white design as a bipartisan gesture (the ruling PUP's blue and white paired with the opposition UDP's red).
What it represents: a blue field bordered top and bottom by red stripes, with a white disc at center holding Belize's coat of arms — mahogany tree, tools of the logging trade, and the motto "Sub Umbra Floreo" ("Under the Shade I Flourish"), simplified here as a laurel ring and shield.