PLS HELP What is part of an effective introduction?

a piece of evidence to support the claim
an interesting quote or fact about the topic
a reason the reader should agree with the writer
an explanation of how the reader can help

1.it provides back ground to the situation

2.it identifies the problem

3.it argues that the problem needs to be solved

4.it summarizes the solution

5.it establishes the writer credibility

Explanation:

answer: the apache, comanche, kiowa, crow, and osage tribes are plains indians.  

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.