Why did the states of prussia lead german unification? .

Bismarck's ultimate goal was to unite the German states into a strong German Empire with Prussia as its core. On September 30, 1862 Bismarck made his famous blood and iron speech, which implied that if Germany was to unify it would be with the use of military force.

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A free trade agreement is a pact between two or more nations to reduce barriers to imports and exports among them.

Explanation:

Under a free trade policy, goods and services can be bought and sold across international borders with little or no government tariffs, quotas, subsidies, or prohibitions to inhibit their exchange.