WHAT HAPPENED IN 1866.
Look what happened the 1866.

The United States Congress passes legislation authorizing the rank of General of the Army. Lieutenant General Ulysses S. Grant becomes the first to be promoted to this rank. (25. July 1866)

The first permanent transatlantic telegraph cable is successfully completed, stretching from Valentia Island, Ireland, to Heart's Content, Newfoundland. (27. July 1866)

New Orleans, Louisiana's Democratic government orders police to raid an integrated Republican Party meeting, killing 40 people and injuring 150. (30. July 1866)

The Grand Duchy of Baden announces her withdrawal from the German Confederation and signs a treaty of peace and alliance with Prussia. (17. August 1866)

President Andrew Johnson formally declares the American Civil War over. (20. August 1866)

Austro-Prussian War ends with the Treaty of Prague. (23. August 1866)

Battle of Curupaity in the Paraguayan War. (22. September 1866)

Venice - Annexion of Veneto and Mantua to Italy - At Hotel Europa, Austria hands over Veneto to France, which hands it immediately over to Italy. (19. October 1866)

A plebiscite ratifies the annexion of Veneto and Mantua to Italy, occurred three days before, on October 19. (22. October 1866)