In considering the international realm, let’s consider the concept of economic treaties. Specifically, let’s think about an organization like the European Union (EU).
Why was it formed? In addition, what are some of the objectives of the nations that are joining the EU?
 
The European Union is perhaps unique in the history of mankind.  It is more than a trade organization but not a United States of Europe either.
Basic info on the EU may be found here:
https://europa.eu/european-union/about-eu_en (Links to an external site.)Links to an external site.