Charlie Hebdo attack in Paris - dunno what happened with this. Overshadowed by: Paris terrorist attack on stadium and club - 130 people died Charleston Church shooting - Replaced by more shootings that happened afterwards (in that year alone: Roseburg, Lafayette, Chattanooga, Planned Parenthood, San Bernardino). Thoughts, prayers, and calls for gun control even if neither of those fix the underlying issues. European Refugee crisis - Agreements with Turkey and Libya have turned this 'crisis' around, but, more boats are arriving in Greece lately.
Just a few examples I blatantly copied off of a website. Nobody talks about these things anymore because Trump used a sharpie.