From the origins, the Roman Republic was defined in opposition to the Roman Empire or the Roman Democracy, the Roman republic had a very specific set of laws and rules which they used to rule the area. This was also the reason why they were so successful as a conquering force during their times.
B. People in the United States took more vacations
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The Decisions at the Atlantic and Yalta conferences affected the structure and purpose of the United Nations because they showed that to keep peace in countries, these countries must be stable. It also called for freedom of elections and the right of people to choose their own leaders in Soviet Union territory, although the Soviet Union greatly opposed this.
Basically, the conferences made sure there would not be another horrific world war