. In the early 1800s, new inventions changed the way many tasks could be performed. The image shows an early sewing machine. How do you think people sewed clothes beſpre this machine was invented? What impact do you think this invention had on daily life?​

a. competition with other nations.

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: