Question

what made modern writers make a shift from idealism to realism​

Answer 1

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According to Google:-

Philosophically, realism and idealism comprise opposing approaches to the definition and pursuit of national objectives abroad. Realists tend to accept conditions as they are and to define the ends and means of policy by the measures of anticipated gains, costs, necessities, and chances of success. Idealists tend to define goals in ideal, often visionary, forms, and presume that the means for their achievement lie less in measured policies, relying on diplomacy or force, than in the attractiveness of the goals themselves.

According to my bheja (brain lol):-

The shift of idealism to realism was due to modernisation.

Answer 2

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The shift of idealism to realism was due to modernisation.