How did Frederick Williams 1 help to unify Prussia after the death of his farther in 1713?
Leopold I allowed Frederick William I to unify Prussia as a kingdom that needed ruling. Because of this Prussia allied with Austria against King Louis XIV of France in the Spanish succession war.
Frederick began to build his nation's status when Leopold I, archduke of Austria and Holy Roman emperor, was convinced by Frederick to allow Prussia to be ruled as a kingdom. This agreement was ostensibly given in exchange for an alliance against King Louis XIV of France in the War of the Spanish Succession.