Got to look at history on this one (feel free to correct my history lesson if im wrong):
Egypt fell to a variety of issues. Outside invaders, collapsing internal structure.
Ancient Greece was too loosely structured to really survive any outside invaders....eventually it was just overwhelmed. Alexander the Great did good uniting the known world, but too much land and too many problems led to its downfall.
Ancient Rome fell due to terrible leaders, threats from the all directions, and collapsing internal systems.
England was just passed up by other countries. Defeating the Spanish Armada put them on the map for imperialism, but after the American Revolutionary War, they werent the same.
Germany and Japan 1925-1945 had great leadership (depending how you see it), but we're absolutely wrecked by the rest of the world.
Soviet Union was a power but had bad leadership and even worse economy.
Japan seems to be the new contender, doing what the U.S. did in 50 years, in less than 10.
Bad leadership is just one cause....internal problems and other things cause a society to fall as well
Just a thought
