Which of the following showed the impact of nationalism on foreign policy

There would be a heavy Nationalistic point inside the foreign policy, in which treaties & alliances would only forged when it benefits the Nationalistic country, & that war would be declared, or that they would only join a war if there would be a huge benefit that can be reaped from the war. Nationalistic views can also lead to a country taking over another one and turning them into a colony to further the resources available or making the nationalistic country more strong.

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the answer is d. selective incorporation. (apex)