US, Japan, Spain, Prussia
Eastern Germany, Poland, Kaliningrad (Russian exclave), Czech Republic. But, since Prussia's boundaries have changed many times, not necessarily all of those countries at once.
If you mean in the Congress of Vienna, the countries were Prussia, Russia, Austria, Britain, and France.
Prussia, Russia, United Kingdom, Saxony, Sweden and Sicily.
No. Russia and Prussia are two very different countries. Prussia is the forerunner of Germany and its people were primarily Germans.
Prussia no longer it exists, but it was where some central and eastern European countries now are.
Austria, Britain, France, Russia, and sometimes Prussia, with limited or no participation by other delegates.
France and Spain.
No, Prussia was an old power in Europe that consited of now a day countries such as Germany, Netherlands, and others.
The two countries that invaded France were Astria and Prussia.
Germany, Poland, Russia, Lithuania, Denmark, Belgium and the Czech Republic were formally part of Prussia.
Frederick the Great of Prussia was the most powerful.