a. The secession of Confederate states from the Union.
United States government refused to recognize the rights of southern states. After the election, South was convinced that Abraham Lincoln could end the institution of slavery. South Carolina was the first state which was ceded from Union. With the help of conventions, seven southern states seceded from the Union for the establishment of the Confederacy within three months after the election. This was the most serious session in the history of United States which result in the Civil War where the Union armies defeated Confederacy.
Answer: Post-traumatic stress disorder
Explanation:
Post-traumatic stress disorder could be defined as a scenario where an individual experiences a bad situation in life, that they were affected by the situation. When experiencing such situation, their subconscious mind is affected, this experienced situation dwells in their subconscious mind and play back images of the situation especially when same scenario or something linking to that scenario wants to happen again. So, Mila's experience and her avoidance of going out could be summed up that she's currently having a posttraumatic stress disorder from the flood event.
Through natural selection called evolving
The pilgrims arrived first
