The Great Arsenal of Democracy: Questions

In line 11, FDR says, "Never before since Jamestown and Plymouth Rock has our American civilization been in such danger as now." What is the significance of Jamestown and Plymouth Rock? Rhetorically speaking, what was FDR trying to accomplish by mentioning those places?
What are the biggest differences between dictatorships and democracies? Do you think it would've been possible for the two governments to exist together peacefully? Why or why not?
Throughout the speech, FDR rarely mentions Japan, or the conflict in the Pacific. Why do you think that is?
In line 133, FDR says, "And it is no more un-neutral for us to [send munitions to our allies] than it is for Sweden, Russia, and other nations near Germany to send steel and ore and oil and other war materials into Germany every day of the week." Do you agree that the U.S. could remain neutral, even while supplying the Allies with weapons? Do you think the Axis saw it that way?
How did FDR's plan to transform America into "the great arsenal of democracy" alter the way the United States deals with conflicts around the world? Do you believe it was a positive change or a negative change?