The Northwest Ordinance is considered a historical milestone because it 209 more than doubled the size of United States established a method for admitting new states to the Union encouraged state legislatures to ratify the Constitution O proposed treaties with American Indians to allow the peaceful settlement of new territories by the time yall answered its probably alrdy too latr but just putting it here​

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:

stay home

hope it

the correct answer is b.