Assyria - An ancient kingdom that existed from the 24th century BCE to the 7th century BCE, Assyria was located in what is now modern-day Iraq, Syria, and Turkey.
Carthage - A powerful city-state in North Africa, Carthage was destroyed by the Romans in the 3rd century BCE.
Prussia - A powerful kingdom that existed from the 18th century to the early 20th century, Prussia was located in what is now modern-day Germany, Poland, and Russia.
Tibet - A sovereign state in Asia, Tibet was occupied by China in 1950 and is now an autonomous region within China.
Czechoslovakia - A country in Central Europe that existed from 1918 to 1993, Czechoslovakia was split into two separate countries, the Czech Republic and Slovakia.
Yugoslavia - A country in the Balkans that existed from 1918 to 2003, Yugoslavia was split into several different countries, including Bosnia and Herzegovina, Croatia, Montenegro, North Macedonia
East Germany - A socialist state that existed from 1949 to 1990, East Germany was a part of the Soviet Union and was absorbed into West Germany after the fall of the Berlin Wall.
South Vietnam - A country in Southeast Asia that existed from 1955 to 1975, South Vietnam was conquered by North Vietnam during the Vietnam War.
Siam - An ancient kingdom that existed from the 14th century to the 20th century, Siam is now known as Thailand.