How did nationalism and industry play a role in uniting countries

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Explanation:

Nationalism is an movement that promotes the interests of a particular nation, especially with the aim of gaining and maintaining the nation's sovereignty over its homeland.

Industry is a sector that deals with the production of goods.

Nationalism encourages self determination in people's heart, countries such as Germany, Greece, Bulgaria, and Serbia were formed by peoples having a common sense of national identify. In Europe, rule by monarchies and foreign control of territory was replaced by self-determination and newly formed national governments.

Nationalists think that the best way to have freedom by a people who are oppress by another group of people or who are forcefully control by another group of people is for each group to have their own nation. This will make every group of people to have control over there own lives.

Industrialization has also contributed to the unity of countries, whereby good are exchanged between countries.

This ideology has United Nations accross the world. Wars between nations have reduce. Fear of domination has greatly decrease in people's mind.

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the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.