The root causes of farmers' unrest and protests in the late nineteenth century were O banking and railroads
O weather and mechanization.
O legislation limiting the size of family farms.
O the abolition of slavery and the labor system that was to take its place.​

A

Explanation:

They contended with economic hardships born out of rapidly declining farm prices, prohibitively high tariffs on items they needed to purchase, and foreign competition

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:

lol   that was   funny : >