Answer :
The causes of the growth and decline of civilizations, and their
expansion to a potential world society, are complex. However,
civilizations require not only external advances to prosper, but also
the maintenance and development of good social and ethical relationships usually grounded in religious and spiritual norms.
Answer:
Because of the cultural assimilation
Explanation:
Cultural assimilation is the process to absorb elements of another culture, maintaining many of its elements, but incorporating the ones of its culture, sometimes referred to as the dominant culture. For example, when the Romans dominated the Greeks in the first century before Christ, they assimilated many of the cultural elements of ancient greek, reformulating here and there.