I only visited Paraguay once when I stayed 1 day in Assuncion, the capital.
But we know a lot of Paraguay because of a war. The Paraguayan War, when a dictator from Paraguay decided that Paraguay must have access to the Atlantic Ocean and invaded Brazil, Argentina and Uruguay. it was 1864, the war lasted up to 1870 and was won by Brazil, Argentina, and Uruguay. This was a bloody war. The Paraguay was almost complete destroyed and half the population dyed. Brazil lost 50k, Argentina 18k and Paraguay about 150k (there is a huge debate about this number from Paraguay).