What is your favorite country in South America?

Argentina.
Argentine football, Argentine tango.
Miguel Najdorf)

But for the first time I learned about Argentina by watching the dance of the Argentine gauchos performed by dancers of Moiseev ballet.

https://youtu.be/FRDlBQcBiwA

Of course, the Argentine gauchos do not dance like that, it is a staged dance using the characteristic movements of the gauchos. Here is a short video of the GAUCHO fiesta at Rancho Santa Susana.

https://youtu.be/lVtnNpZCII8

It's not a gaucho either, but there are a lot of real gauchos among the audience, with big knives (facon), so he dances properly. And we can see - Moiseev copied the main movements quite accurately.

Bro I am in 4th grade and my geography is better
Uruguay

I like Paraguay

I like that they have embraced their native language (Guarani).
About 90% of Paraguayans speak Guarani. (Spanish and Guarani are the official languages of Paraguay)

@KNIGHT_c4 said in #16:

Guarani
That's cool, it's rare for native languages to remain prevalent in colonized areas of the world

Tierra del Fuego
Fireland

Gotta be Chile; literally its length is as much as from New York to San Francisco.