Correct

分崩离析

/ fēn bēng lí xī / 
Strokes

Definition

to collapse and fall apart (idiom); to break up/falling to pieces

Example

Definition

(of a nation, alliance, coalition, group, etc) come/fall apart; fall to pieces; disintegrate; collapse

1
Zhànhòu
战后
dìguó
帝国
zhǔyì
主义
fēnbēnglíxī
分崩离析
  
。

The post-war era saw the disintegration of the imperialist powers.