Page "Civil war" Paragraph 57
The power of non-state actors resulted in a lower value placed on sovereignty in the 18th and 19th centuries, which further reduced the number of civil wars.
For example, the pirates of the Barbary Coast were recognized as de facto states because of their military power.
The Barbary pirates thus had no need to rebel against the Ottoman Empire, who were their nominal state government, to gain recognition for their sovereignty.
Conversely, states such as Virginia and Massachusetts in the United States of America did not have sovereign status, but had significant political and economic independence coupled with weak federal control, reducing the incentive to secede.