Which three statements support the idea that South America is a single cultural region? The Mardi Gras tradition is celebrated with grand parades in Argentina, Brazil, Colombia, and Uruguay. Cricket and soccer are both popular in the multicultural South American nation of Guyana. Many people in Chile, Argentina, Ecuador and Peru practice Roman Catholicism. Brazil is the only South American nation to have Portuguese as the official language. In most Latin American countries, the majority of locals speak Spanish.