Which resulted in rebellions in Greece, France, and the Habsburg Empire in the mid-1800s?

A. rise of nationalism in Europe after the defeat of Napoleon

B. spread of Orthodox Christianity to western Europe

C. decrease in industry and agricultural output in southern Europe

D. buildup of armies and navies in Great Britain and France

"SPRING OF THE PEOPLE" or as this period is called "THE YEAR OF REVOLUTION" is the period when Europe was swept up by the widest wave of revolutions.
More than 5 states were affected, but there was no coordination or cooperation among revolutionaries from different states.
The causes of these events should be sought in the earlier period of 1814-1815, when at the Congress of Vienna the powerful decided to return power to the hands of the established rulers. This meant the formation of a "Holy Alliance" tasked with militarily suppressing revolutions and protests in Europe. Based on this decision, France becomes a monarchy again, and it ceases to be a republic.
In 1848, a revolutionary wave began in France in February, and immediately spread to most of Europe.

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