Declaration of Independence
, then Articles of Confederation
, then the United States Constitution
, and finally, the Bill of Rights :'D
The answer is: Runners allowed villages and cities throughout the empire to communicate quick with rulers far away.
Hope this helps!:)
Scientists like Einstein, Bethe, Fermi, Teller, and Bloch emigrated from "Germany" in order to escape persecution and pursue scientific research, since this took place during the rise of the Nazi Party, which was highly anti-Semitic.
Confederate troops fired on Fort Sumter in South Carolina's Charleston Harbor. Less than 34 hours later, Union forces surrendered. Traditionally, this event has been used to mark the beginning of the Civil War. So the second one.