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.
Boca Juniors and River Plate are 2 clubs that come to mind, huge rivalry that is known about worldwide, Copa Libertadores winning history, the amount of top class players that have played for both clubs and then moved to Europe and both clubs have incredible fan bases