Definition of nationalism:

Nationalism is an ideology and movement that promotes the interests of a particular nation especially with the aim of gaining and maintaining the nation's sovereignty over its homeland. Nationalism holds that each nation should govern itself, free from outside interference, that a nation is a natural and ideal basis for a polity, and that the nation is the only rightful source of political power. It further aims to build and maintain a single national identity-based on shared social characteristics such as culture, ethnicity, geographic location, language, politics, religion, traditions and belief in a shared singular history -and to promote national unity or solidarity. Nationalism, therefore, seeks to preserve and foster a nation's traditional culture, and cultural revivals have been associated with nationalist movements. It also encourages pride in national achievements, and is closely linked to patriotism. Nationalism is often combined with other ideologies, such as conservatism or socialism.

Nationalism is a way of thinking that says that some groups of humans, such as ethnic groups, should be free to rule themselves.

Explanation:

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b) the confederacy had to pay all union war expenses.