Independent Republic of Kiribati
Who & why: the Gilbert Islands gain independence from Britain on 12 July 1979, taking the name Kiribati — simply the Gilbertese rendering of "Gilberts." The new nation is a striking geographic outlier: its 33 scattered atolls straddle the equator and every line of longitude on Earth, and in 1995 Kiribati redrew its own stretch of the International Date Line so the whole country could finally share one calendar date. Low-lying and coral-built, it is today counted among the nations most existentially threatened by sea-level rise.
What it represents: the upper half is red, carrying a yellow frigatebird in flight above a yellow rising sun of seventeen rays, one for each of the Gilbert group's inhabited islands at independence; the lower half is blue-and-white wavy stripes standing for the Pacific Ocean that surrounds and connects them.