The mongols is history's biggest land contiguous empire that grew under the leadership of Khan,and was made of nomadic people. It sprung from eastern Europe and spread all the way to the far east.
The Mongolians were an exception because they perfected the mail system,protected the silk road, and left a legacy of unified political units such as Russia and China.
C is the answer hope it helps
The best answer in regards to the specific question appears to be A: Many small towns boomed as people came to drill wells.
The answer is Franz Joseph Haydn. :) good luck
