United States: American
Canada: Canadian
United Kingdom: British
Australia: Australian
France: French
Germany: German
Italy: Italian
Spain: Spanish
Japan: Japanese
China: Chinese
India: Indian
Mexico: Mexican
Brazil: Brazilian
Russia: Russian
South Korea: Korean
Egypt: Egyptian
Turkey: Turkish
Argentina: Argentine or Argentinian
South Africa: South African
Thailand: Thai
Norway: Norwegian
Sweden: Swedish
Denmark: Danish
Poland: Polish
Greece: Greek
Portugal: Portuguese
Netherlands: Dutch
New Zealand: New Zealander
Saudi Arabia: Saudi
Indonesia: Indonesian
Middle Eastern Countries
Jordan: Jordanian
Syria: Syrian
Lebanon: Lebanese
Iraq: Iraqi
Palestine: Palestinian
Israel: Israeli
Kuwait: Kuwaiti
Bahrain: Bahraini
Qatar: Qatari
United Arab Emirates: Emirati
Oman: Omani
Yemen: Yemeni
Iran: Iranian
Some countries have unique nationality names, like Swiss for Switzerland or Dutch for the Netherlands. Many nationalities end with -an or -ian, such as Jordanian from Jordan or Iranian from Iran.
With this extended list, you can easily identify people from around the globe. Practice using these in sentences to improve your vocabulary!