A large number of settlers move to a new place, bringing with them their own culture, traditions, and societal norms. They refuse to adopt, learn, or even care about the traditions or societal norms of the people who were already there. Their very presence does irreparable harm to the indigenous culture.

Q: What is this phenomenon called?

Modern leftists have two different answers:

If the settlers have light skin, then they call it colonization, and it's a bad thing.

If the settlers have dark skin, then the leftists call it immigration, and it must be encouraged.