If this is true or false, this would be true.
The Peace of Westphalia, concluded in 1648 in Münster (Germany), ended the Thirty Years War, which started with an anti-Habsburg revolt in Bohemia in 1618 but became an entanglement of different conflicts concerning the constitution of the Holy Roman Empire, religion, and the state system of Europe.
As I am thinking you mean "Producers" when you say "Sellers" I am going to go with, Yes. You are correct it is Supply.
(Also the other one is called Demand not price)
Democracy, The United States, under its Constitution, is a federal, represent- ative, democratic republic, an indivisible union of 50 sovereign States.