Is it better for a ruler to be feared or respected and why

What kind os source would a historian use to get a firsthand account of a past event

Which of the following best describes us involvement in the korean peninsula today?

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.