Countries encouraged nationalism leading up to World War I by asking citizens to
burn crops in their own country to keep food from the enemy.
cooperate with other countries to prevent conflict.
buy products from other countries to boost the economy.
support their own country in times of need or conflict.

ASAP RN

Nationalism is an idea and movement which holds the idea nation should be congruent with the state. As a movement, nationalism is inclined to promote the interests of a particular nation, especially with the aim of maintaining and gaining the nation's sovereignty (self-governance) over its homeland to create a nation state.

Nationalism holds that every nation should govern itself, free from any outside interference , that a nation is an ideal and natural basis for a polity and that the nation is the only true source of political power. It further aims to build and maintain a single national identity, based on the shared social characteristics of culture, ethnicity, location etc.

What was World War I?

World War I, often abbreviated as WWI began in July 1914 and ended in November 1918. Referred to by contemporaries as the "Great War", its belligerents basically included most of Europe, the Ottoman Empire, the Russian Empire, and the United States, and , with fighting also expanding into the Africa, Middle East, and parts of Asia.

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