What are functional regions?

Explanation:

A functional region is an area surrounded by smaller areas. They usually more metropolitan in their settings. These regions transcends local and state boundaries. A functional region is often made up of a city which is surrounded by smaller towns and villages. The city provides the political structure and administration for all the encompassed areas. The smaller areas  can supply other materials like agricultural resources to the city area.

what events in mexico's history might explain why the country continues to have difficulty improving social justice and economic opportunities for all people?