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1. Which was never an independent country?
Texas from 1836-1846; Vermont from 1777-1791 and Hawaii from 1795-1893.
2. Which was never an independent country?
West Germany from 1949-1990; North German Confederation from 1866-1871 and East Germany from 1949-1990.
3. Which was never an independent country?
Senegambia from 1982-1989; Czechoslovakia from 1918-1992 and Tanzania from 1964 onwards.
4. Which was never an independent country?
East Timor (Timor-Leste) from 2002 onwards; South Sudan from 2011 onwards and North Korea from 1948 onwards.
5. Which was never an independent country?
Kingdom of England from 927-1707; Kingdom of Scotland from 843-1701 and Wales at various times throughout the Middle Ages.
6. Which was never an independent country?
Ghana Empire from 300-1250; Mali Empire from 1226-1610 and Benin Empire from 1180-1897.
7. Which was never an independent country?
Singapore since 1965; Monaco since 1861 and Vatican City since 1929.
8. Which was never an independent country?
Florence from 1115-1569; Genoa from 1099-1797 and Pisa from 1000-1406.
9. Which was never an independent country?
Zanzibar from 1963-1964; Barbados since 1966 and Samoa since 1962.
10. Which was never an independent country?
Serbia since 2006; Slovenia since 1991 and Slovakia since 1993. Sokovia is a fictitious country from the Marvel Cinematic Universe.
I'm pretty sure Danzig was a country in the early/mid 20th century. It's even listed as a country in this quiz.
Updating it now, thanks for noticing!