For how long did the slave importation clause prohibit a ban on importing enslaved people 10 years
20 years
39 years
55 years

The US constitution protected a states involvement in the Atlantic slave trade for twenty years from federal prohibition.

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: