List the 2 treaties that the us signed with foreign countries to resolve conflicts

Plz ? ? 20 points for this question ! hhjc6

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.

Which is an effective question for launching history inquiry related to the cold war