<span>maya IS CORRECT :) srry i need to make it longer</span>
<span>In the 1830s President Jackson signed the Indian Removal Act of 1830 a policy of relocating Indians from the Southeast to the Midwest for their own protection. The resulting forced emigration is known as the Trail of Tears. The Indian Appropriations Act of 1851 set the precedent for modern-day Native American reservations through allocating funds to move western tribes onto reservations since there were no more lands available for relocation.</span>
<span>Dred Scott was a slave who sued for his freedom. His owner brought him to a free state. Therefore Dred Scott was a on free land making him free. Chief Justice, Roger B. Taney ruled against Dred Scott saying that he was property and not a citizen. The South now felt that they could now bring their slaves to any free soil. The North was man and said that it was a Southern conspiracy. I hope this answers your question!</span>
I think you're answer is Athabaskan.
Hope this helps!
I am going to go ahead and say that your answer is C because regions can end for many reasons and most of which I'm certain of which are affected by the physical characteristics of the region.
I hope that this helps. :)