Terrorism deaths in the US 1970-2020, summarizing " START (National Consortium for the Study of Terrorism and Responses to Terrorism). (2022). Global Terrorism Database, 1970 - 2020.  The counts are plotted on a log scale, so percentage changes are comparable regardless of the size.  For example, the huge spike in terrorism deaths per million population coincides with the ISIS occupation of Mosul in 2014. That appears as a dramatic increase in terrorism in the log plot, but it doesn't seem as dramatic relative to the previous data as it seems in absolute terms.  The plotting symbols / letters code for the organization that primarily collected the data during those years:  p = Pinkerton Global Intelligence Service (PGIS).  c = The Center for Terrorism and Intelligence Studies (CETIS). i = The Institute for the Study of Violent Groups (ISVG). s = The National Consortium for the Study of Terrorism and Responses to Terrorism (START).  The data are available with “terrorism”, in Ecdat: Data Sets for   Econometrics[1] (in en), (Please provide a date or year), Wikidata Q114631237.
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DavidMCEddy