Why were us workers against the ratification of the north american free trade agreement (nafta) in 1992?
they worried about losing jobs to developing countries where workers could be paid less.
they were worried that their employers would have more business, creating a labor shortage.
they did not want an increase in mexican agricultural workers immigrating to the united states.
they disagreed with canada's politics and did not want to trade with canadian businesses.

do u have choices or

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: