The Great Wall of China is the longest building on earth with a length of 13,170 miles. Made from a combination of brick, stone, wood and other materials, it was originally constructed primarily to serve as a defence against the nomadic invasions from the north that threatened Chinese states / empires.
This was called Westward expansion. It provided land for agriculture. this was important because he wanted America to be all agriculture and less factories. It doubled the size of America as well as gave us control of the Port of New Orleans.
The answers a and d would be the correct answers to this question
