Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Hesse:

"

Following mediation, the Congress of Vienna had significantly fewer states remained in the region that is now Hesse: the Hessian states, Nassau, Waldeck and Frankfurt. The Kingdoms of Prussia and Bavaria also held some territory in the region. The Congress established the German Confederation, of which they all became members. Hesse-Hanau was (re-)absorbed into Hesse-Kassel in 1821.[citation needed]