A historian compares the events by period since he compares them by time period
I truly want to say A is the answer , B isn't anything I believe because of the gold rush.
Mainly through better advancement in technology and our understanding of engineering. What with us going from living in caves to making wooden homes to now living in steel and concrete.
Answer:
This belief in the manifest destiny lead to the friction over seas because is said that <u>expansion was not only good but bound to happen </u>
