What are three examples of ethnic nations?

Ethnic nationalism, also known as ethno-nationalism, is a form of nationalism wherein the nation is defined in terms of ethnicity. The central theme of ethnic nationalists is that "nations are defined by a shared heritage, which usually includes a common language, a common faith, and a common ethnic ancestry".

b: the establishment clause  

b: socialism  

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.