C, because that was basically one of the reasons for the Civil War as well. The Northern and Southern states were always fighting about whether slavery should expand west or not.
True I think, but in terms of life? False. Europeans, however, unlike the Chinese, sought to build vast empires all across the world, even in the new world, that's why most of human history is European exploration, and wars, and the like.
Your answer is C, <span>Economic Recovery Act.</span>