1. name three new weapons or methods of warfare first used during world war i. what effect did the introduction of new technology have on the war? 2. how well did the treaty of versailles address the causes of world war i? did the treaty include any of wilson’s ideals as expressed in his fourteen points? write a brief essay that assesses how well the treaty of versailles addressed the causes of world war i and whether or not the treaty incorporated any of wilson’s fourteen points.

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:

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".