Cultural homogenization was a process where different cultures became more similar and less diverse as ideas such as beliefs, languages, and behaviors were spread between them.
In 2259, R'ongovian diplomat Vasso L'Gaelia asked T'Pring, whose katra was secretly inside the body of Spock, "What is the logic of an alliance with a federation whose interdependence merely dilutes the cultures that comprise it?" T'Pring responded that as a Vulcan, she sympathized with Vasso's fears that they would lose their culture to homogenization in a multilateral alliance like the United Federation of Planets. (SNW: "Spock Amok")