France declared war in the prussian dominated north german confederation because

Because of the revelation of the Ems Dispatch, a document that reveals a supposed exchange of insults between the Prussian king and the French ambassador. The effect was inflamatory in both countries. But this was only a pretext. Tensions and historic grievances - Prussia was an enemy of France in the Napoleonic wars -  had accumulated for several decades and there were the always pressing issues of the balance of power in Europe. A dispute over the royal Spanish succession also accelerated the Franco-Prussian War  that finally erupted in 1870.

Explanation:

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trade in silk, spices, and precious metals.

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