Hello! Nationalism is an idea and movement that promotes the interests of a particular nation (as in a group of people),[1] especially with the aim of gaining and maintaining the nation's sovereignty (self-governance) over its homeland. Nationalism holds that each nation should govern itself, free from outside INTERFERENCE (self-determination), that a nation is a natural and ideal basis for a polity[2] and that the nation is the only RIGHTFUL source of political power (popular sovereignty).[1][3] It further aims to build and maintain a single national identity, based on shared social characteristics of culture, ethnicity, geographic location, language, politics (or the government), religion, traditions and belief in a shared singular history,[4][5] and to promote national unity or solidarity.[1] Nationalism seeks to preserve and foster a nation's TRADITIONAL cultures and cultural revivals have been associated with nationalist movements.[6] It also encourages pride in national ACHIEVEMENTS and is closely linked to PATRIOTISM.[7][8][page needed] Nationalism is often combined with other ideologies such as conservatism (national conservatism) or socialism (left-wing nationalism).[2] Explanation:Hope it helps you a lot Please mark me as brainliest..