1.He was having too much of temper and he use to drink alcohol.
2.His personality was too eccentric for those people around him after a while. Right before he died, he was beginning to lose the absolute loyalty of those people near him.
3.His interest in integrating/intermarrying different cultural groups with the Greeks did not sit well with many of his native countrymen, who believed that the ethnic people they encountered were insubordinate to the Greeks.
4.His enormous dreams and plans to continue conquering new territories would lead to his eventual undoing. Immediately after his death, his Companions divided up his massive empire amongst themselves.
One strenth of his Empire is that his army was undefeated at the time. His phalynx and calvary and allied calvary were his greatest parts of his army. He was and undefeated warior himself and gave courage to his army by leading it from the front. Alexander was taught by Aristotle himself because he was so smart. He was a great commander and the greatest general of all time.
Weaknesses: He was a drunkard at times and ruined part of his empire and he was so hungry for power and land that he ran right into his undoing and got hit with an arrow. Historions think that his wound got infected and that that is how he died.
