There's no picture attached :/
The correct answer is C. South Carolina was the first state to secede from the union, and the first battle took place in Fort Sumter.
I believe the answer is true
The definition would be "the military doctrine that an enemy will be deterred from using nuclear weapons as long as he can be destroyed as a consequence"
source: https://www.vocabulary.com/dictionary/nuclear%20deterrence
Survival was difficult in the great plains, both for white settlers and for Native Americans. Natives were constantly moving westwards towards Oregon in a difficult journey where many died due to diseases or fighting. For the white settlers, it was difficult because they lived in fear of Native Americans who didn't want to move and rebelled against it and sometimes attacked the settlers. This was happening on a daily basis.