Nobody made south America poor; like every continent poverty was the natural state. South America just did a worse job at developing the infrastructure, rule of law, institutions and culture necessary to lift itself out of poverty as fast as north America.
With the exception of Argentina, which after WW2 was one of the richest countries in the world, but through bad political choices ended up impoverishing itself.
If you have any desire to not be remarkably ignorant of 20th century history, I’d suggest spending a few minutes reading about who in North America did a bunch of coups and otherwise created the conditions for a lack of rule of law in South America.
With the exception of Argentina, which after WW2 was one of the richest countries in the world, but through bad political choices ended up impoverishing itself.