English please not everyone can understand?!
The answer to this question is Located <span>important routes for trade and travel
The lewis and clark expedition was also known as The corps of Discovery. This expedition was ordered shortly after united states bought Louisiana in order to explore the region. As it turned out, the expedition lead to several paths that could be used to travel natural resources, and the expedition contributed to the discoveries of most of United States western region today.</span>
I think T'ai-tsu is the person who made Changan his dynasty's capital
The answer of question 10 is Kansas-Nebraska act
