Both groups are called Slavs. In the years before World War I, Serbia wanted all Slavic peoples to form one empire, free from rule by the Turks or Austria-Hungary. The Serbs' wish to unite all the Slavs in one empire is an example of. imperialism.
The answer to your question is true
Thomas Jefferson is the best in my opinion because he knew good conflicts and other things
United States saw it as another alliance.