Translation of nationality in Spanish

The airport was huge, compared to Siem Reap's one, of course. We expected something similar to Bangkok's airfield but it was completely different. We stood in line for the passport control.
We were considering flying to the same region again: we thought of going to Brazil, Venezuela or Guatemala. We were asking a lot of friends on their travel experiences to these countries.
We decided to make a one day trip to Bolivia, which turned out to be the correct decision. Instead of driving all the way up to the Salar de Uyuni, we stayed close to Chile and visited the area of the lagoons.