Where did the Aztec Empire develop?

How do oceanographers measure the salinity of ocean water?

Agricultural practices in the united states nearly led to the extinction of the peregrine falcon during the 1950s and 60s.

Short answer/constructed response: respond to the question in 3-5 complete sentences. give details or examples to support your answer. attempt to answer all parts of the question in paragraph form! using the source 1 map, pick two of the 1800's territorial acquisitions you believe were the most important in the development of the united states. provide at least two reasons per territory to explain why you think they were the most important.