East Friesland had already been absorbed the year before on the death of the last Duke without issue.
In spite of the exhaustion of men and money in the two Silesian wars, Friedrich found himself ready with both men and money eleven years later, in 1756, to embark upon what is known as the Seven Years' War.
Though without acquiring fresh territory by this war, the gain in prestige was so great that the Prussian monarchy virtually assumed the hegemony of North Germany, becoming the rival of Austria for the domination of Central Europe, the position in which it remained for more than a century afterwards.

Nevertheless, after this succession of wars the condition of the country was deplorable.

It was obvious that the first thing to do was the work of internal resuscitation.

The extraordinary ability and energy of the King saved the internal situation.

Agriculture, industry, and commerce were re-established and reorganized.