What effect did the shift in population have on american politics?
a. as the south's population grew, the south became more liberal.
b. as the south's population grew, the south's votes became less
important.
c. as the south's population grew, so did the south's political
influence.
d. as the south's population grew, many politicians moved south.

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:

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