Answer:
On July 4, 1776, the Congress issued the Declaration of Independence, which for the first time asserted the colonies' intention to be fully independent of the mother country. The Congress established itself as the central governing authority under the Articles of Confederation, which remained in force until 1788.
I'm afraid I couldn't give you a complete answer, or the answer that you're looking for, for this question regarding the Native-born Americans in 1860's since there is no map provided with this question. Try re-posting this question with the map on it.
The correct answer is C. <span>by buying it from France.</span>
The event is known as the Luisiana Purchase and took place in 1803. The land was bought by the U.S. for US $15 million
It was <span>missionaries, traders, fur trappers</span>
