Kublai Khan, the grandson of the infamous Genghis Khan was actually a very strong leader. He practiced religious tolerance, so Option D) is removed.
He was also the first non-native emperor to conquer China, and he freed up the Silk road for his empire. Therefore, the answer is A) During his reign, trade and social reformation with the West (Europe) increased.
For the answer to the questions above, I believe that <em><u>it is because the constitution is a living document and it should not be stagnant and resistant to change, and is therefore allowed to change to meet the USA's needs at the time.</u></em>
What is working before maybe won't work in the future.
The event which best shows the destruction of the natural landscape due to the settlement of the West is The US government allocated certain regions of the West for American Indianreservations.
