The answer to the blank is "classical".
The correct answer would be C) To mine diamonds. This is because the Europeans wanted the silver and gold to be mined, and they wanted slaves to work on plantations so they didn't have to do as much work. Nothing was ever said about diamonds during my American History segment.
first let me give you a list of them...
1). sand creek massacare.
2). battle of little big horn.
3). battle of wounded knee.
4). the little big horn.
5). battle of palo euro canyon.
and there you go there were five major battles in the west between 1860 and 1890.
hope this helps!