Answer: D.
Explanation: The U.S. sends people to discuss environmental issues with China.
Beacuase they thought they were intuders to there territory
I think it was because transportation was made way easier and it offered better options for people who wanted to travel. Also i believe at the time the west was rich because of the foreseen treasures such as gold found there so people wanted to travel west to get rich.
Answer:
D; California had started industrialization; helping a increase
**I am not sure either
