Detailed Instructions: Given a text, write a compressed version of it in a single sentence.
Problem:For almost 50 years after Platae, peace reigned at home, and the victorious city-state entered its most brilliant era. Athens was instrumental in bringing the disparate Aegean and mainland communities together, creating a "league of nations", known as the Delian League.
Solution:
For almost 50 years after Platae, peace reigned at home and entered its most brilliant era.Athens was instrumental in bringing the disparate together, creating the Delian League.