How did Spartan society change after defeat at the Battle of Leuctra in 371BCE?

Spartan defeat at the Battle of Leuctra in 371BCE heralded a new age for the city state. Theban invasion and constraints put upon it's alliances, territories and freedom for the helots made the former powerhouse of Greek politics a second-rate power. But the battle also coincided with significant demographic and social change within the Spartan state. This homework task is designed to increase student understanding of the NSW Ancient History syllabus
Higher School Certificate course
Part II: Ancient Societies
Option I: Spartan Society to the Battle of Leuctra
It can also be used as part of
Part IV: Historical Periods
Option J: Fourth Century Greece to the death of Philip II of Macedon