Republic of Formosa
The Republic of Formosa (), was a short-lived republic that existed on the island of Taiwan in 1895 between the formal cession of Taiwan by the Qing Dynasty of China to the Empire of Japan by the Treaty of Shimonoseki and it being taken over by Japanese troops. The Republic was proclaimed on 23 May 1895 and extinguished on 21 October, when the Republican capital Tainan was taken over by the Japanese. Though sometimes claimed as the first Asian republic to have been proclaimed, it was predated by the Lanfang Republic in Borneo, established in 1777, as well as by the Republic of Ezo in Japan, established in 1869.
Flag of the Republic of the Rio Grande
The Flag of the Republic of the Rio Grande was used in 1840, during 283 days from January 17 to November 6, as long as the republic existed. This country was formed by the northeastern Mexican states of Coahuila, Nuevo León, and Tamaulipas. The flag was no longer used following the defeat of the Republic of Rio Grande by Mexican troops.