What keeps a keel boat upright?

The weight of the keel keeps the boat upright. the more weight the more less the list will be in a given wind speed. The downside is that the more weight you use the heavier and slower the boat. this brings us to why not all keel boats are the same as some are built for speed and some for stability. my boat is nearly 50/50 weight distribution this means half my boats total weight is in the keel the rest is the boat itself this makes my boat very stable and able to sail in high wind conditions. The downside is my boat isn't as fast as others. Some boats have 35/65 that's 35% of the weight is in the keel this makes them fast but not very stable.