Which military formation did the greek use to defeat the persian army?

I believe the answer would be Phalanx.

Phalanx,which was a shoulder to shoulder hoplites where they would lock their shields together

Abolition of slavery

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.