fragmentation

US /ˌfræɡ.menˈteɪ.ʃən/
UK /ˌfræɡ.menˈteɪ.ʃən/
1.

sự phân mảnh

the action or process of breaking something into small parts or of being broken up in this way:

:
It was partly the fragmentation of the other party which helped to get the Republicans reelected.