The dispute that sparked the Franco-Prussian War centered on which of the following?

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The candidacy of a member of the Hohenzollern dynasty to the Spanish throne is what led to the dispute between France and Prussia. France feared that if a Prussian ruler was on the Spanish throne, it would upset the balance of power in Europe and make France vulnerable to attack from both Prussia and Spain. This fear led to a diplomatic crisis, which ultimately led to the outbreak of the Franco-Prussian War.

The Dispute That Sparked the Franco-Prussian War Centered on Which