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Confederates fired on Ft. Sumter.
German submarine warfare
The event that triggered the fighting between the north and south was when Jefferson Davis ordered that Fort Sumpter be attacked. This started the American Civil War. States rights and slavery were also trigger points.
The secession of the various Southern states (following South Carolina's lead) was triggered by Lincoln's rejection of the final compromise, because it would have allowed some extension of slavery. The actual combat was triggered by the firing of Confederate artillery at the Union garrison on the island of Fort Sumter in Charleston Harbour.
It would depend on which civil war you are referring to.
What event triggered the great depression
Invasion of poland
invasion of poland
Hitler's invasion of Poland in 1939.
Militancy triggered by the cultural and territorial encroachment resulting in the Creek War.
Confederates fired on Ft. Sumter.
Germany's invasion of Poland.
German submarine warfare
The Assassination of Archduke Franz Ferdinand of Austria triggered the start of the Great War (World War I)
the great depression triggered WWI
The breaking point was when Germany invaded Poland on September 3rd 1939
The event that triggered World War 1 was the assassination of Archduke Franz Ferdinand of Austro-Hungary on June 18, 1914 in Sarajevo.