They're also called assassin bugs and are pretty common. If you treat around your house for bugs like ticks, fleas, ants and termites you're probably using an insecticide that will also control these things.
Yes I know ticks aren't bugs, but none of what I listed are true bugs.
And now my skin is itchy.
By the way, not only are ticks not bugs, they aren't even insects, they are arachnids. Many insecticides have no effect on them.
http://www.cdc.gov/parasites/chagas/gen_info/vectors/
This doesn't mean the bugs are common in these states, or even when bugs are present, that they have the parasite responsible for Chagas.
The CDC also lists them as the same thing.
It is possible all these sources are right. There are many species of this pest and while all can carry the Chagas disease worm apparently only 5 of prime concern as an infection vector for humans. It could be that none of those 5 are called assassin bugs.