Its defeat and takeover by Alexander the great.
It did because they were not good empires
The empires that fell were the roman empire since they fell in 407 Ad
Military problems an political issues
The Russian Empire, The Austro-Hungarian Empire and The German Empire
Gravity.
Colony collapse is when bees mysteriously disappear. Vampire mites and nicotine-based insecticides are among the possible causes.
marshal plan
Causes of collapse for which rescue breathing may be needed are anaphylactic shock, heart attack, and poisoning.
as all empires of that era are destined to fall, the Byzantines would fall right after it great conquest and economy collapse only to be save by the next empire.
The collapse of a star is based on its age. When it runs out of "Fuel" its inside contracts as the outside expands. it can then super nova or collapse into a tiny star.
high potassium causes arrhythmias and the arrhythmias that it causes can reduce blood pressure causing someone to collapse.
The roofs of these caves collapse