Roman engineers built bridges and roads, which allows for more quicker travel from one part of the empire to another. They also built forts and walled cities in many places, and filled them with supplies, so that if there was a revolt, the Romans there (if they are outnumbered) are able to take refuge inside until reinforcements arrived.
These all help their military have a higher chance of surviving, faster transportation, etc, and it made their armies the most strongest in that era
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Answer:
The westward expansion affected the Native American tribes because the colonists were taking over their land and driving them out which would lead to the trail of tears where the Native Americans either died,got sick, or suffered from loved ones dying.
Women's suffrage movement
It means that the power of the Pope and the church in the matter of state affairs of one nation is deteriorating to the point that Napoleon proclaimed himself as Emperor of the French Empire without the full consent of the Church especially of the Pope. It also signifies the changes and reforms of the way the society and the system works in one state and the separation of the Church and the State.
The reason that the United Nations was because the people supported it. Having more support from citizens always helps.