Answer:
Those supporting the idea of a European Civil War contend that the heads of state in many European nations were so closely related as to constitute branches of the same family. European culture is also relatively homogeneous, with most nations tracing the roots of their culture to two principal sources, namely Christianity and classical antiquity. While separate, their respective legal systems were remarkably similar and evolved to become more so over time.
Explanation:
Entangling alliances grew the small conflicts instantly.
When Austria-Hungary attacked Serbia for just the region of Bosnia-Herzegovina, automatically Russia and Germany were in the war.
About 10 to 14 days depends where in Japan or california
