Republic of Cuba
Who & why: the Republic of Cuba is formally inaugurated on 20 May 1902 as the US military government withdraws, and the rebel Lone Star flag of the independence wars is adopted as the official national flag. Cuba's early decades are shadowed by the Platt Amendment (repealed 1934), which reserved the US a right of intervention; the 1959 revolution led by Fidel Castro then overturns that republic's government entirely, installing a one-party socialist state that endures to this day — a sweeping change of government and ideology, but not, at any point, of flag.
What it represents: the Lone Star flag designed in 1849 by Narciso López with the poet Miguel Teurbe Tolón and first raised at Cárdenas on 19 May 1850. Cuba became independent on 20 May 1902, when the flag was officially adopted and Máximo Gómez raised it at the Morro castle; a decree of 21 April 1906 set its specifications (Wikipedia's references also cite 6 January and 24 April 1906). The three blue stripes stand for Cuba's three historical departments, the white stripes for the purity of the patriot cause and the red triangle for equality, fraternity, freedom and blood shed.
Wikipedia: designed 1849 by López and Teurbe Tolón; first raised 19 May 1850; adopted 20 May 1902; decree 21 April 1906; meaning of the stripes. FOTW: López credited 1849; adopted 20 May 1902; official explanation of the stripes and triangle.
- Flag of Cuba — Wikipedia compiled
- Cuba — Flags of the World (CRW Flags) compiled
Not established: Wikipedia's own references differ on the 1906 date.