Important answer asap
what was the impact of the kent state shootings?
1. it promoted the need for higher campus security in ohio
2. it led to the temporary closure of 500 colleges
3. it ended the need for using the national guard to intervene at state colleges
4. it ended protests on college campuses for the duration of the vietnam war

2. It led to the temporary closure of 500 colleges

Explanation:--more than 500 American colleges & universities were closed by mid-May;

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:

can we see the cartoon?