The 20th Amendment, also called the Lame Duck Amendment, decreased the amount of time between the presidential election and the inaugration of the new president. What were the advancements that allowed for this amendment?

As technology advanced, with the telegraph and then the telephone making communications faster and easier, and the railroad and then automobile reducing travel time, the time allowance became unnecessary.

Explanation:  

I got it right on my test :D

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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