The Thirteenth Amendment accomplished Lincoln's goal of preserving the Constitution's fundamental structure while bringing it closer to the ideals of the Declaration of Independence
The answer is: Runners allowed villages and cities throughout the empire to communicate quick with rulers far away.
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The reason for this was that after World War II, America enjoyed a huge growth in its economy. Industrialization was the main focus and people now had more money due to the economic prosperity that they enjoyed an increase in income economic opportunities grew where people benefited after the war.
Watergate helped curtail presidential authority