Crazy Horse and six other Lakota Sioux people declared war.
Unification of Germany happened in 1866.
Battle of Papudo happened in 1866.
Oaks explosion happened in 1866.
The Kansas-Nebraska Act of 1854 called for "popular sovereignty" which meant that the people living in that area were to vote on if they wanted slavery or freedom for Blacks. People came from nearby states to try to make the election go in their favor. Many fights and murders happened. In 1861, Nebraska voted to prohibit slavery but the governor vetoed it. the legislature overrode the veto. Nebraska suffrage to "free white males" until 1866 when they changed that to become a state.
They happened from April 1866 to October 1871.
Battle of Trautenau happened on 1866-06-27.
Chincha Islands War happened in 1866.
Battle of Callao happened on 1866-05-02.
Battle of Curupayty happened on 1866-09-22.
Battle of Curuzú happened on 1866-09-03.
Battle of Abtao happened on 1866-02-07.
Battle of Miahuatlán happened on 1866-10-03.