the civil war started in April 12, 1861 and ended in April 9, 1865. the cause of the civil war was because the north was not tolerating slavery as being in our country (United States of America) and so they came with the solution of the civil war
The tradition of building a ziggurat was started by the Sumerians, but other civilizations of Mesopotamia such as the Akkadians, the Babylonians, and the Assyrians also built ziggurats.
It was "Vladimir the Great" who ordered Russians to convert to Orthodox Christianity, since he was very much impressed by the Orthodox churches in Constantinople.