Why are older customs and traditions of groups of people are often lost in an empire?

Older customs and traditions of groups of people often fade within an empire due to cultural assimilation and the dominance of a central culture. As empires expand, they frequently impose their own values and practices on conquered peoples, leading to a decline in local customs. Additionally, the integration of diverse populations can dilute distinct cultural identities, and the pressures of modernization and economic change may further erode traditional practices. Over time, this can result in a homogenized culture that overlooks the rich diversity of its constituent groups.