The Kellogg Briand Pact was a treaty that was negotiated and signed in 1928. It was meant to pretty much outlaw war. It did this by saying that all the countries that signed it were giving up war as an instrument of national policy.
The trouble with this treaty is that there was absolutely no way to enforce it and so it really had no effect.
I can't really list and talk about all the countries involved because there were many of them, even among the first group that signed. There was nothing important about most of them -- it was just that the treaty as a whole was supposed to be important.