What are three clues used to find the root causes of primary sources or historical events?

Sparta faces threats from without and within the city-state who posed these threats.

Which situation would be considered an example of the freedom of association? a. three students write a letter to a local newspaper demanding that a teacher be fired. b. a group forms on a college campus to support a particular political candidate. c. an individual purchases a membership to a local gym. d. a religious organization buys several local lots in order to construct a new church building.

What affected the second industrial revolution have on transportation