I believe its the 20th Century because George C Marshall wasn't born until the late 19th century.
Answer: Learning anything new. On a physiological level, learning new things is good for your brain. According to CCSU Business & Development, practicing a new skill increases the density of your myelin, or the white matter in your brain that helps improve performance on a number of tasks.
Explanation:
Andrew Carnegie is known for his successful business operations in the steel industry and its subsequent charity work.
Answer:
D: "Though we don't yet know when the war will end, it will end, and we will win."
Explanation:
This is the most accurate summary of George's sentiment. Though this isn't necessarily true because most of the wars the United States is involved in were started by us, but hey. A blindly patriotist school is a blindly patriotist school.
In the Gettysburg address Lincoln uses the word nation instead of union.