Explanation:
the 1860s, Otto von Bismarck, then Minister President of Prussia, provoked three short, decisive wars against Denmark, Austria, and France, aligning the smaller German states behind Prussia in its defeat of France. In 1871 he unified Germany into a nation-state, forming the German Empire.
Never before in human history had so many of the world's plants, animals, and microorganisms been so thoroughly and so abruptly mixed and dispersed. We call this phenomenon the Columbian Exchange. Determined to farm the American land in a European manner, the colonists introduced their livestock: pigs, horses, mules, sheep, and cattle.
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For your question, the answer is D
The Thirty Years' War (1618-48) began when Holy Roman Emperor Ferdinand II of Bohemia attempted to curtail the religious activities of his subjects, sparking rebellion among Protestants.
The Dustbowl was the nickname due to dust storms that damaged the agriculture in the U.S and also the severe drought
