Why would a researcher use a secondary source instead of a primary source when analyzing a historical event?

Reformers worked to change schools by making them more:

What was one major effect of industrialization on american society?

The first ten amendments, known as the bill of rights, protect individual freedoms and limit the power of the federal government. what amendment limits the powers of the state government and extends bill of rights' protections to citizens of a state? a) 12th amendment b) 14th amendment c) 15th amendment d) 17th amendment