World's most dangerous cities includes St. Louis, Baltimore, New Orleans, Detroit. (Gun talk #3)

World's most dangerous cities, by murder rate 2020 Published by Statista Research Department, Jul 5, 2021 -  This statistic ranks the 50 most dangerous cities of 2020, by murder rate per 100,000 inhabitants. 

Most of the world’s most dangerous cities are located in Latin America.  Violence in Latin America is caused in great part by drug trafficking, weapons trafficking, and gang wars. 

The highest ranked most dangerous city outside of Latin America is St. Louis in the United States, which is ranked thirteenth with a murder rate of 60.59 in 2018. Detroit, with a murder rate of 39.7, came in at forty-second place.

Why are these four American cities among the most dangerous cities in the world?  What, if any, characteristics do they have in common?