Which is the best example of a primary source used for studying the civil war? a) a biography of a ulysses s. grant b) a journal kept by a soldier during the civil war c) a documentary film entitled, "gettysburg: 140 year later" d) a national park service map of the battlefield of manassas

A journal kept by soldier during the Civil War

Explanation:

because it is created by someone taking part in the Civil War

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.