Names of Countries and Nationalities in English Language

Countries - Languages

Argentina - Spanish
Australia - English
Brazil - Portuguese
China - Chinese
Egypt - Arabic
France - French
Greece - Greek
Ireland - Irish/English
Italy - Italian
Japan - Japanese
Netherlands - Dutch
Portugal - Portuguese
Russia - Russian
Spain - Spanish
United States of America - English


Countries - Nationalities

Argentina - Argentinian
Australia - Australian
Brazil - Brazilian
China - Chinese
Egypt - Egyptian
France - French
Greece - Greek
Ireland - Irish
Italy - Italian
Japan - Japanese
Netherlands - Dutch
Portugal - Portuguese
Russia - Russian
Spain - Spaniard
United States of America - US or American 


Examples

1. Where are you from?
I'm from Brazil.

2. What is your nationality?
I'm Brazilian.

3. What language do you speak?
I speak Portuguese.