When an elector in the electoral college does not vote for the candidate they pledged to support, this elector is known as
a. a faithless elector.
b. a party traitor.
c. an independent elector.
d. an insurgent elector.

C 
 I would like to believe C is the correct answer, I hope this helps!! 

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.