For example the most successful clubs and most powerful in South American history are Peñarol, Boca Jrs, Nacional, Independiente, River Plate, São Paulo, Gremio, Flamengo, Palmeiras and Santos. What other do you think are great or never heard of this top 10 from the Americans clubs?
Peñarol and Nacional from Uruguay and Boca Juniors from Argentina and Sao Paulo are the only ones from South America who has 3 World Cups of clubs. So to me they are the best ones.
According to Conmebol, FIFA and IFFHS, Peñarol from the 60’s was the best team in the history of South America, they won everything they can win, even defeated Real Madrid 0-4 and Eusebios Benfica 5-1 to become world champions.