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.
I think, there are only a couple of South American clubs known world wide these days:
Boca and River because of their rivalry.
Santos because of Pele and Neymar (lots of other well known players but those two for me in particular).
You meant “known by you”. If these are the only ones you know, than that just means you are in a buble and do not know that much about football🤷🏽♂️