It began from Cyrus the Great and him wanting to rule the city states. One of them were called the Ionians. When Cyrus came to conquered them, he raise the taxes and appointed tyrants in the regions. This left the Ionians angry. So, this started the Ionian revolt and they declared war.
Since I'm gonna conquer this land, I'm gonna raise the taxes up.
He is not going to raise the taxes.
In the Battle of Marathon, it was a battle against the Athens and Persians. The Athens did this thing where they put there shields up next to each other in a line. They did this to protect one another and block the Persians. A boy name Pheidippides was a runner that told the Athens that they won against the Persians and that was important to them.
In the Battle of Thermopylea, the city-states that were involved in it were the Spartans and Persians. It was one of the Persians wars. This time, King Xerxes made this war because he wanted to conquered the land. In this war, there were 300 Athens and about about 3,000 or more Persians. The Athen were led by King Leonidas. He found a cave or put his army in one place and let the Persians come to them. Due to the lack of people wanting to join the war, the Persians win and King Leonidas lost.
In the Battle of Salamis, it was against the Athenians and the Persians. They ended up deciding to have there war at land. So, both city-states were building there ships. They were both similar but they were different. The Spartans didn't have an edge to the boat. On the other hand, the Athenians did have an edge to the boat. At the end, the Athenians ended up winning the battle.
In the Battle of Plateau, it was the final battle. This time, the Spartans and Athens teamed up for this war. This war was basically Persia against Greece. The Persians really wanted to conquered Greece. They fought over a river and a forest. At the end, Greece won the final battle.
After all the wars, the Greeks were able to regroup again. The Athens made up League called the Delian League. I it is where they can protect Greece from other invaders. They then made the city-state more powerful in Greece.