This map shows the shifting center of American population in the first two centuries of its existence. What might BEST account for this shifting trend?
A) The increased hurricane activity has created a westward migration.
B) The geographic land forms that once limited movement are no longer there.
C) The increased earthquake activity in the west created an eastward migration.
D) Advances in transportation and technology have made geography less of a limit to population distribution.

Imagine you work as a consultant, and your daily job involves listening to the constructive criticism of others. as part of your job, you must listen to opposing viewpoints to make important decisions. in this activity, you are a consulting dam engineer. you must make a decision about four different dams; should they be repaired, taken down, or left alone? you will listen to contrasting opinions about what should be done with the dams before you make the final decision. as the consulting dam engineer, what do you decide to do with this dam? explain your reasoning. by making your decision, did you support the opinions of the mayor and/or the dam safety official? why or why not? (site 1)