Answer:
he believed it was about preserving the Union
The answer for this question is: <span>the election of Abraham Lincoln as President
Abaraham Lincoln was always known as someone that really see slavery as something that undermines human's value.
Not long after elected as president, Abraham Lincoln made several policies that make it harder for the southern states to keep their slaves, which led to the first secession.</span>
(D)The development of stone tools, because the neolithic age has to do with the development of human tools.
Provided land as long as worked the land 10 years or so and then the land is yours
etiher a or b is the good answer
