The Sand creek massacre was when the U.S army attacked, killed and mutilated 70-500 native Americans, 2/3 were women and children. Hope this helps, plz mark brainliest.
It would be "rope" that led to the closing of the open range, as farmers started to close off their land to other people and cattle. Barbed wire was not generally used.
The technique of Robert Browning in "my last duchess" is known as a dramatic monologue. This is so because all the poem is expressed in one voice only, as oppossed to a dialogue, where more voices would appear. And it is dramatic because it contains all the elements of drama.
