Support or refute : the emancipation proclamation freed no slaves.

richard nixon led the investigation that resulted in alger hiss being convicted of prejury.

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 correct answers are the following

a proxy war which functioned as a training field for wwii

republican democratic goverment

national side, leaded by the fascist general franco

the spanish civil war took place between 1936 and 1939 and was fought after a military coup undertaken on the 17th july 1936 by a group of generals that had seceeded from the spanish republican army, under the leadership of general franco, and who aimed to expel the democractically-elected republican goverment from power.

this war became a proxy war in which european powers tested their military equipment. on one side, urss and mexico supported the left-wing republican spanish goverment, while nazi germany and fascist italy supported the national fascist side.

franco managed to win the war in 1939, with the significant contribution of the foreign military support, and became the dictator of spain until his death in 1975.

explanation:

mark brainliest and have a great day!

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