Polk settled the oregon boundary dispute with the british by: agreeing to a border along the 49th parallel. paying the british $10 million to give up their claim. sending the navy to back up the u. s. claim. agreeing to a permanent joint occupation of the pacific northwest. promising not to go to war with mexico.

Agreeing to a border along the 49th parallel.

Explanation:

James K. Polk was a candidate from Tennessee that was not known to most Americans and he was the responsible for created the “fifty-four or fight” slogan. Despite of that, he was secretly willing to compromise and not go into war. And in June 1846 Britain proposed splitting Oregon at the 49th parallel, Polk agreed with that and war was avoided.

a and c?

i think it is a and c

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: