Terrorists live and die by media attention. Devoid of public exposure for their grievances and actions, terrorists are unable to instill the fear necessary to enact political changes and attract fresh adherents to their cause. It's not surprising then, that the rise of mass media throughout Europe and the United States, coupled with the installation of telegraph cables capable of transmitting news worldwide during the 1850s and 1860s, coincided with a trend where violent radicals, upon reading of each other's attacks, found inspiration for emulation.