califag checking in. currently living in the southern part of the state and I just want to point out that this chart is outdated. When it comes to California, at least in my local area (which you can probably guess at) MS13 is definitely active and very prominent. This is based on recent gang graffiti I have noticed and nothing else.
I also want to point out that just a few years ago, there was very little MS13 in this area and other gangs seemed much more prominent, implying MS13 kind of sprang up out of nowhere amongst many other older and well established gangs.. but this is all based on conjecture as I am not a gangbanger myself. Just my 2 cents.