At the time when the United States of America decided to build the canal, Panama was a part of Columbia. Today, the canal is an essential route for maintaining good maritime trade links. It can take about eight hours to complete a full journey along the Panama canal.
The Tyler and Polk administrations
Both administrations strongly supported American westward expansion.
John Tyler pressed for the annexation of Texas as a slave state during his administration (1841-45) and at the end of it, he signed a Texas annexation bill into law, which was admitted as a state in the first year of Polk's presidency.
James K. Polk, who ruled from 1845 to 1849, also supported American expansion to the point he led the U.S. into the Mexican-American War (1846-48) in which the U.S. gained what is today California and much of the present-day Southwest.
Humans change their environment both positively and negatively and the environment affects how humans live in many different ways. The main interactions between humans and our environment can be grouped into the use of resources and the production of wastes.
I think number 8 is B hope this helps!!:)
