Select the correct answer from each drop-down menu. The engaged in the practice of human sacrifice. The Aztecs built the city of .

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.

The correct answer is b

Correct answer is: - elites