why civil war break out and when did peace was finally restored?

Answer 1

I am assuming you are talking about the American Civil War. World-wide there are more civil wars in human history than you can count.

When the Confederate States essentially recinded their support for the Constitution and adopted, with minor expedient alterations, the former Articles of Confederation (which is what we had before the Constitution was approved), that was the break--but not the war. Lincoln refused to relinquish control of military bases in the south, though many were staffed by Southerners and simply changed flag and uniforms. Fort Sumpter wouldn't pull down the flag and hand over the keys. So the shore batteries kept the resupply ships away. Then they bombarded the fort directly when getting impatient. Ironicly, the first soldier to die was from an accidental cannon discharge AFTER the fort surrendered.

As for the peace, it came gradually. As with the war of 1812, where in the biggest battle came two weeks after the peace was agreed, communications and lines of command were so fragmented that surrender was not uniform across the South. Still, it was very often swiftly adopted by the bulk of the population--they were more than tired of the war. As with every conflict, however, there were pockets of opportunists and the disgruntled. By and large, when news came that Lee surrendered, it became like a steady rain with Southern troops packing up and heading home all across the South.

Answer 2

The South felt Washington DC was making too many unfair demands on them and they seceded.

Officially, peace was restored April 1865

Answer 3

That depends entirely on what country you are referring to.