As nouns the difference between affiliation and confederacy
is that
affiliation is the relationship resulting from affiliating one thing with another while
confederacy is an alliance.
As a proper noun Confederacy is
the informal name for the
Confederate States of America, the collection of American states that seceded from the United States in 1861, and fought against the Union in the American Civil War.
affiliation
English
Noun
(
en noun)
The relationship resulting from affiliating one thing with another.
A club, society or umbrella organisation so formed, especially a trade union.
confederacy
English
Alternative forms
*
Noun
(confederacies)
an alliance