It's hard to define a decisive turning point in Greek history as there were many.
However, one that really might stand out apart from the rest was their wars with the Persians. They were successful in their defence against a Persian invasion, an invasion of an empire that was drastically bigger than the combined Greek lands.
The Enlightenment promoted the ideas of a belief in progress, and a faith in science. That religion was not the only way to view the world and live. It promoted a more secular outlook.
This is not a school question, is it? You are trivializing genocide. The way to do what you are asking, though, is to become informed and do well enough in school so that you can become a political scientist of historian, so that you can have a real voice and be heard and influence people.
Start by googling the Armenian genocide. No, start by trying to answer why it's wrong to say what you just said. Look the word up.
Well the National military leaders were trying to take control of the imperial government.
Why, The Wilmot Proviso amendment would have closed California and New
Mexico to slavery in 1846 as a requirement for their annexation,
but Congress did not pass the proviso.