CzechoslovakiaCzechoslovakia was established in 1918, following the dissolution of the Austro-Hungarian Empire at the end of World War I. Its history was marked by turmoil, with Nazi Germany annexing the country during World War II. After the war, it came under Soviet influence and became a communist state. In 1988, a peaceful revolution ended communist rule, and in 1993, Slovakia declared its independence, leaving the remaining part as the Czech Republic, now also known as Czechia.
Federal Republic of Central AmericaAfter gaining independence from Spain in 1821, Central America was briefly annexed by Mexico. By 1823, the region regained independence and formed the Federal Republic of Central America. However, internal conflicts, including two civil wars, eventually led to its breakup in 1840. This split resulted in the formation of the countries we know today as Guatemala, Honduras, El Salvador, Nicaragua, and Costa Rica.
Korean EmpireThe unified Korean Empire existed from 1897 to 1910, after which it was annexed by Japan. Following Japan’s defeat in World War II, the Korean Peninsula was divided. The Soviet Union occupied the north, leading to the creation of communist North Korea, while the south became the Republic of Korea, a pro-Western state. The two countries remain divided to this day.
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North and South YemenFrom 1967 to 1990, Yemen was divided into North Yemen and South Yemen. The two reunited after South Yemen lost financial support following the collapse of the Soviet Union. However, Yemen is currently in the midst of a civil war, and its future as a unified nation remains uncertain.