Central and state governments influence each other in a unitary system.
a federal system.
a confederal system.
a democratic system.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

rain drop drop top my name is nick harris and this is my pawn shop

joseph stalin's cult of personality became a prominent part of soviet culture in december 1929, after a lavish celebration for stalin's 50th birthday.[answer:

explanation: