Alliances

Alliances can be:

Economic - Several countries help each other with economic growth (eg European Union)

Trade - Where there is a trade pact where the focus is on exporting and importing products with other countries.

Military: Can be defensive (if someone attacks one of the members, everyone will come in to protect him) or attack (if one attacking a country all will help) or both

Alliances can be of one or several types, depending on the rules and purpose of their creation.