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1.Became independent in 301 AD?
Monaco
✓
San Marino
✓
Both
✓
From the Roman Empire.
2.Borders the Mediterranean Sea?
Monaco
✓
San Marino
✓
Both
✓
San Marino is landlocked by Italy.
3.Has a monarchy?
Monaco
✓
San Marino
✓
Both
✓
4.Has a national football team which is a member of FIFA and UEFA?
Monaco
✓
San Marino
✓
Both
✓
Monaco has a national football team which has not joined FIFA or UEFA and therefore does not in participate in major international tournaments.
5.Has a population lower than 50,000?
Monaco
✓
San Marino
✓
Both
✓
Monaco has 38,300 inhabitants and San Marino has 33,344.
6.Has never won a medal at the Olympic Games?
Monaco
✓
San Marino
✓
Both
✓
...despite both competing.
7.Is not a member of the EU?
Monaco
✓
San Marino
✓
Both
✓
8.Has a GDP per capita of over 180,000 US dollars?
Monaco
✓
San Marino
✓
Both
✓
9.Is the least visited country in Europe?
Monaco
✓
San Marino
✓
Both
✓
San Marino received 84,000 visitors in 2018 whereas Monaco received 347,000 according to UNWTO: https://bit.ly/3gW47t2
10.Has won the Eurovision Song Contest?
Monaco
✓
San Marino
✓
Both
✓
Monaco won in 1971 with the song "Un banc, un arbre, une rue" by Séverine. They declined to host the following year.
11.Relies on another country for its defence?
Monaco
✓
San Marino
✓
Both
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Monaco relies on France and San Marino on Italy.
12.Bans its citizens from gambling?
Monaco
✓
San Marino
✓
Both
✓
Although famous for gambling, Monaco only allows this for tourists and foreign residents.
13.Shares its name with its capital city?
Monaco
✓
San Marino
✓
Both
✓
San Marino City is the capital of San Marino, Monaco is a city-state and is its own capital.
14.Uses the euro?
Monaco
✓
San Marino
✓
Both
✓
As per agreement with the Council of the European Union.
15.Made Abraham Lincoln an honorary citizen?
Monaco
✓
San Marino
✓
Both
✓
In 1861, Abraham Lincoln sent a letter to San Marino saying, "Although your dominion is small, nevertheless your State is one of the most honoured throughout history…". In response, they granted him citizenship.