The Grand Canal was a technology and public project under Yangdi that helped unite China, but it should be noted that there were other things as well.
The technology necessary for navigating such journeys had not yet been invented. Ships had to become better, then they needed maps and charts, compasses, and anything similar.
It's not A because Lewis and Clark explored it.
I'm pretty sure the answer is D. from what I've researched the lands were really hard to farm on that the government had to pass a Homestead Act to get people to settle there.
Answer:
the north wanted the new states to be free states. slavery was another thing they argued about, the south wanted the new states be slave states with cotton, rice, and tobacco fields. also the dred scott case, john browns raid on harpers ferry, uncle toms cabin written by harriet beecher stowe
Explanation:
