Here are the answers to your questions based on historical context:
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Why did the states in the Upper South secede after the fall of Fort Sumter?
Answer: President Lincoln asked each state to send soldiers to put down the rebellion.
(The fall of Fort Sumter and Lincoln's call for troops to suppress the rebellion pushed several Upper South states to secede.) -
Why did Southerners join the Confederate army commonly?
Answer: To defend their land and way of life.
(Many Southerners viewed their involvement as a defense of their homes, culture, and way of life against what they perceived as Northern aggression.) -
Men from the _____________ commonly joined the army because of the invading Union army.
Answer: South.
(Southern men joined the army largely in response to the presence of Union troops and the desire to defend their region.)