Yes, I would say that good leadership was key to Imperial Rome's success because to be able to conquer such a vast area north of the Mediterranean stretching from Spain (and England) in the west to Palestine in the east and to be able to exploit the mineral deposits of many of these countries and to control the areas conquered without major rebellions must have required good leadership.
You could say the world was a bit surprised if not in shock due to Nazi Germany and the Soviet Union signing the German-Soviet Nonaggression pact.
Answer:
Indian Removal Act - the federal law that forced resettlement
of American Indian tribes on lands west
of Mississippi River
Cherokee Nation v. Georgia - the Supreme Court case that said Cherokees
did not have right to sue in federal court
Worcester v. Georgia - the Supreme Court case that said Georgia did
not have the right to enforce laws in
Cherokee territories