What are two positive and two negative effects of the current relationship with Cuba on U. S society or the U. S government

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:

the roman army grew in size and became dominant in the mediterranean region.

they died with poison from the god patrick

a.

congress passed laws allowing for free passage between states.