Dashed left edge = started before June 1866 ·
Dashed right edge = ongoing beyond June 1866
Events in June 1866 4
1866Battle of RidgewayFenian raid into CanadaIrish-American Fenian militants crossed from the United States and fought Canadian militia near Ridgeway, Ontario, in an attempt to pressure Britain over Irish independence. Though a tactical Fenian victory, the raid failed to hold territory and spurred support for Canadian confederation.
1866Fourteenth Amendment proposed by CongressSent to the states for ratificationThe amendment guaranteed citizenship and equal protection under the law to all persons born or naturalized in the United States. It became one of the most consequential amendments to the US Constitution once ratified in 1868.
1866Austro-Prussian WarSeven Weeks' War between Prussia and AustriaPrussia went to war with Austria over dominance of the German Confederation, drawing in most other German states on either side. Prussia's rapid victory, sealed at Königgrätz, ended Austrian influence in German affairs and cleared the way for Prussian-led unification.
1866Battle of CustozaAustrian victory over Italy in the Third Italian War of IndependenceAustrian troops defeated the numerically superior Italian army near Custoza in Veneto. Despite the battlefield loss, Italy still gained Venetia at the war's end through its alliance with Prussia.