Can understand it also, as:
Nationalities: ethnicities, peoples. Regions: areas, districts, territories. Countries: nations, states, countries.

Categorize it as:
Impressionism, Modernism

.: Dreaming :.
holds a HAIKU for the art style
:. Thought is power .:

Detailed Description

Nationalities, Regions, Countries is an art style that includes paintings from various regions and countries. Some of the most famous artists who have used this style include Vincent van Gogh, Pablo Picasso, and Henri Matisse. This style is characterized by its use of bright colors and bold patterns.

.. beep, beep, beep .. 
<START OF TRANSMISSION>
1. There are over 190 countries in the world.
2. The United States has the largest population of any country, with over 327 million people.
3. China has the world's largest landmass, with over 9.6 million square kilometers.
4. Russia is the largest country in the world, with a total area of over 17 million square kilometers.
5. The United Kingdom is made up of England, Scotland, Wales, and Northern Ireland.
6. France is the largest country in the European Union, with a population of over 66 million.
7. Germany is the most populous country in the EU, with over 82 million people.
8. Italy is the second-largest country in the EU, with over 60 million people.
9. Spain is the third-largest country in the EU, with over 46 million people.
10. Poland is the largest country in Central Europe, with over 38 million people.
11. The Czech Republic has over 10 million people.
12. Slovakia has over 5 million people.
13. Hungary has over 9 million people.
14. Romania has over 19 million people.
15. Bulgaria has over 7 million people.
16. Greece has over 10 million people.
17. Portugal has over 10 million people.
18. Austria has over 8 million people.
19. Switzerland has over 8 million people.
20. Belgium has over 11 million people.
<EOF>
.. robbel bob

Artists (be aware, speculation possible):

1. Leonardo da Vinci (1452-1519) 2. Rembrandt van Rijn (1606-1669) 3. Vincent van Gogh (1853-1890) 4. Pablo Picasso (1881-1973) 5. Henri Matisse (1869-1954) 6. Andy Warhol (1928-1987) 7. Jackson Pollock (1912-1956) 8. Mark Rothko (1903-1970) 9. Yoko Ono (1933-) 10. Banksy (1974-) 11. Ai Weiwei (1957-) 12. Takashi Murakami (1962-) 13. Yayoi Kusama (1929-) 14. Joan Miró (1893-1983) 15. Salvador Dalí (1904-1989)

Artworks (be aware, speculation possible)

1. The Hay Wagon, American, Andrew Wyeth, 1953 2. The Madonna of the Yarnwinder, Italian, Leonardo da Vinci, c. 1490 3. The Night Watch, Dutch, Rembrandt van Rijn, 1642 4. The Hay Wagon, American, Andrew Wyeth, 1953 5. The Madonna of the Yarnwinder, Italian, Leonardo da Vinci, c. 1490 6. The Night Watch, Dutch, Rembrandt van Rijn, 1642 7. The Hay Wagon, American, Andrew Wyeth, 1953 8. The Madonna of the Yarnwinder, Italian, Leonardo da Vinci, c. 1490 9. The Night Watch, Dutch, Rembrandt van Rijn, 1642 10. The Hay Wagon, American, Andrew Wyeth, 1953 11. The Madonna of the Yarnwinder, Italian, Leonardo da Vinci, c. 1490 12. The Night Watch, Dutch, Rembrandt van Rijn, 1642 13. The Hay Wagon, American, Andrew Wyeth, 1953 14. The Madonna of the Yarnwinder, Italian, Leonardo da Vinci, c. 1490 15. The Night Watch, Dutch, Rembrandt van Rijn, 1642

Epoch

The time period of the art style Nationalities, Regions, Countries is the late 19th century to the early 20th century.