It was the <span>departure of the Allied Nation of "Russia" in late 1917 was a turning point in the war, since Russia withdrew from the war due to an internal revolution, which brought about a new era of communism. </span>
Answer: violation of establishment clause of first amendment. Favored the parents over the schools.
Explanation:
The US had many attempts at compromise with varying levels of sucess before the Civil War. However, when Lincoln was elected president (on the platform of stopping the expansion of slavery), the South lost hope and seceded.
There is always a solution other than war, however, in this case, war had been a looming possibility for quite some time, and compromise probably would've only pushed the war back a year or two.
Hope this helps :)