What statement describes a similarity between source 1 and 2 ?

Both are pieces of historical evidence. Hope this helps!

Explanation:

polling is a process and the outcome is not involved in the process itself.

the outcome, which is an unfavorable rating for a particular candidate is not affected by the mechanical process of polling.

it rather depends on the number of people voting in favor of the candidate.

this is an outcome of people's preferences.

a. favoring native born americans over immigrants.