In 100 to 200 words explain how the market economy developed into the American system. How did the the three unique regions come together as a whole to push America forward as a world competitor.

awwww thank you for the free points so sweet of youuuuuu

lmaaoo just playin i know there not free but im swiper ;DDD

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: