What was the main effect of the persian wars

Athens became the leader of the Greek city-states as a result of the Persian wars.

Explanation:

The main effect of the Persian wars was that Athens became the leader of the Greek city-states since they formed an alliance which came to be known as known as the Delian league. The Delian league became a very strong force that was able to withstand their possible conquest.

a countries leader should be motivated by the common good of the country.

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.