the confederation
'Confedarion' is gibberish. -You possibly mean 'confederation' which is a group of confederates, especially of states or nations, united for a common purpose. -(A letter or two missing makes a huge difference)
The European Common market sought to encourage trade between several nations, especially member nations.
Opec.
A group of people gathering with a common cause is normally termed "A Convention"
because they can, scapegoating others especially if they are more well off is a common technique of politicians instead of fixing their own problems.
CARICOM is an abbreviation for Caribbean Community and Common Market. CARICOM is a organization of 15 nations and dependencies with the purpose to promote economic integration.
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The imperialist nations have in common in the 19th century was that they were industrialized.
They are internationally recognized nations.
Common Purpose UK was created in 1989.
The population of Common Purpose UK is 125.
There are commercial products especially designed for that purpose, though they aren't common. A large "auto specialties" store is the best place to check.