What was the most powerful ruling body of the government in the ancient rome

How did enlightenment ideologies influence the declaration of independence is f he rights of man and citizen

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.

Who did the first work in creating vaccines