Building a dam across a river can lead to because sediment becomes trapped behind the dam.

chinese civil war took place over a long period of time between 1927 and 1950. the war was interrupted when japan invaded china in 1936 and by world war ii. the war was fought between the nationalist government of china, also called the kuomintang (kmt), and the communist party of china (cpc). 

2 pie thats it no explanation like the dude above me jesus christ