Which free trade agreement initially involved 27 european nations coming together to form the world's largest overall economy?

The CORRECT* answer your looking for is "EU".

Explanation:

EU stands for European Union, the EU is a build up of European nations, thus the name Union meaning (United/Conjoined). I hope this helps anyone that would like to know the answer :)

Feel free to 5* and like.

i would say b. research typically uses a variety of sources

answer; during stalin"s rule, many mothers told their children that he was the greatest thing to ever happen to russia;