Answer:
The Battle of Gettysburg was a turning point in the Civil War, after the battle the Union army was unable to capture any more Southern states.
D. People with asthma or other respiratory illnesses.
This is correct because people with these issues struggle a bit more with their immune systems more than others. Their lungs and other respiratory organs can become irritated faster than those of non-asthmatic people and such in that area.
Similarly to the state government and the national national parks
