Their diet changed as a result of new types of food and plants. Moving to a new area had a different diet, specific to that region that they had to adapt to.
The 10,000 Immortals were called so because whenever one would die, they were replaced, so that there were always 10,000 men
We went back to "Undisturbed Isolationism". We cut ourselves off diplomatically for the most part from many European powers out of fear of being brought into another World War. America was completely and only about America.
Answer: The key represents his sacrafice.
Explanation: