I am not sure when it started. However, it seems as if people everywhere have been crazy about zombies for the past 10 years or so. Perhaps it began back in 2004 with the release of the remake of Dawn of the Dead. It seems it was around then that

published Jul 5, 2018 5:44:33 PM, by Mark Niquette (Bloomberg) — U.S. companies for months bemoaned the tariffs on Chinese imports that will take effect Friday. Now they fear the worst is yet to come in an escalating confrontation with Beijing over trade. Duties on $34 billion of Chinese goods