Which of the following was NOT a result of new innovations and technologies in the late 1800's and early 1900's? A.
The construction of high rise buildings that allowed cities to expand upward.

B.
Immigration decreased due to the growth of manufacturing.

C.
Telephones and radios made communication faster and more efficient.

D.
Mass production and the assembly line made new technologies more affordable.

answer --

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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: