President james buchanan was a bold, decisive president after several southern states seceded and immediately took action to strengthen union forts in the south.
group of answer choices

true

false

false

Explanation:

James Buchanan was a weak incompetent president

a. factors that are used to make goods and services

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: