Short Answer:
There are a few in the States; Washington, Cali, Texas & Arizona according to the web site.
There are quite probably many other schools teaching 'Krav Maga' who aren't certified or authorized to do so.
As a fighting style, Krav Maga ranks up towards the top for effective self-defense systems.
At advanced levels most training principles intersect and you can't tell JKD or Kajukenbo from Krav Maga or Systema.
If you can't find a Krav Maga school then one of these fighting styles (or their derivatives) might suit your taste.
Prolonged discourse:
Most martial arts (Tae Kwon Do, many Karate schools and the like) focus on one or two ranges of fighting and never move beyond that. Furthermore, the concept of rules limit a student's options to what is legal in the 'game' while training. The only 'rule' of a real confrontation is to WIN.
A fighting style is an 'advanced' martial art that doesn't bind you with rules and limits in a fight. It presents options and choices & teaches multiple ranges of combat and defense against weapons you might encounter on the street (knife, gun, club / stick). It also tries to bring out the fighting instinct (fight or flight) and hone that (mindset training) so that you can protect yourself or loved ones.
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