He served in various capacities in the Civil War, and in1865-1867was a member of the state House of Representatives, becoming secretary of the commonwealth in1873-1878and again in 1879-1882, recorder of Philadelphia in 1878-1879, and state treasurer in 1886-1887.
Deane's capacities and activities were now required for the navy.
Upon the conclusion of the treaty he went to Stockholm as plenipotentiary; and in both capacities he behaved with resolution and address.
Between 1858 and 1868 he was employed in home waters on a variety of special services, chiefly connected with gunnery, signalling and the tactical characteristics and capacities of steam warships.
These differences may be arranged in two main groups: (a) Those which have arisen between state and state in their sovereign capacities; (b) Those in which one state has made a demand upon another state, ostensibly in its sovereign capacity, but really on behalf of some individual, or set of individuals, whose interests it was bound to protect.