Alexander's father Philip, expanding the Macedonian empire, called up Persia's invasion of Greece, over a century earlier, as a Propaganda reason to take on the Persian Empire. Philip was assassinated before his departure on the campaign and his son Alexander took it over.
Alexander the Great was born a century after the end of the Persian War.
The Persian War ended a hundred years before the yet-to-be-born Alexander crossed any river.
No he did not war pants! they were not invented yet..
Alexander the Great, 70 years later.
Alexander's conquest.
The war had been over for a hundred years when he came on the scene.
The war was Alexander's invasion of the Persian Empire, lasting 10 years in which time he won many battles.
Western history would have moved on regardless of the Persian War. Had the Persians won the war, the elasticity of the Greek world would have thrown it off. Alexander the Great, inheritor of a Macedonia which was a vassal of Persia at the time of the Persian War, demonstrated this when he conquered the Persian Empire.
He conquered the Persian Empire. Whether the killing and misery of ten years of war was great is a matter for thought, however the people of his time gave him that title.
Alexander the Great established the city of Alexandria (named after himself) as he captured the Persian Empire. This was over a hundred years after the end of the Persian War which ended in 449 BCE.
I know that the first war he fought in was The Battle of Granicus during May in the year of 334 BC! It was between Alexander and the Persian Empire! Hope this helps! =D
Alexander the Great declared war on the Persian Empire, which was the dominant power in the region at the time. His campaign began in 334 BCE when he crossed the Hellespont into Asia Minor, seeking to liberate the Greek cities under Persian control and ultimately conquer Persia itself. This conflict was part of his broader goal to expand his empire and spread Greek culture.