They did want to be imperial
The Bill of Rights: George Mason, Thomas Jefferson, James Madison.
I believe its Florida but I'm not for sure
Sandburg alludes to B. famous battlefields in this passage.
The battle of Gettysburg happened during the American Civil War, the battle of Ypres occurred during WWI, as well as the battle of Verdun. He is referring to these famous battles and the fields where they happened because he wants to make a powerful impact on the reader/listener.