Remember, the 15-21% growth rate you cite is off a very depressed level.  There are a ton of currently un/underemployed architect types who have to be absorbed into the industry.  By that time, we will probably be in the middle of another economic collapse in the building industry.  Do your homework, but my advice is stay away.  It's just not an economically viable profession even in the good times.  Sorry for the pessimism.

The problem with structural engineering is that if the architects are out of work the structural engineer is out of work.  If you do bridges, dams, etc. it is probably different, but for engineers who rely on architects and buildings for work, they will have the same problem.  Unfortunately, not as many things get built in a crappy economy.

There are a lot of structural engineering positions open in Texas, many with oil services but many not. They are generally good jobs with good pay and benefits. The OP has a masters in history which costs six years and resulted in no employment and now he wants to spend three more years to get another masters is a field that is just as toxic as Ebola for employment prospects? Free advice: go to Houston, Dallas, or Austin and get a job, any job, and establish residency in Texas. Then check out majors at public universities that will give you a future such as petroleum engineering, civil engineering, marine engineering. Get a basic bachelors in your field and work toward your PE.

Volunteer is right if you were a petroleum engineer in Texas right now skys the limit.  Shoot the truck drivers and mechanics make more than architects out in the oil fields.  Of course you have to live in an oil field in a man camp but hey you could rake it in.  

Well you don't have to live in a "man camp". The civil engineers and marine engineers and most petroleum engineers have a very comfortable life style. Those don't are rewarded very well for a few weeks of roughing it. Better than a god-awful cubicle. There are also pages and pages of 'architect' jobs available in Texas. Unfortunately 98 percent of those are for information technology jobs. The industry formerly known as "architecture" has already lost use of the word. But keep pretending - at all costs.

you should get your degree somewhat near the area you'd like to work.  No one in Texas will have even heard of 3 of the 4 schools of architecture in michigan.  Unfortunately they are all very expensive too.  Because architecture is so cyclical it is very risky to say that the economy will be booming when you finally graduate.  

I assume that you already have significant student loan debt, taking on additional debt for a low paying job is probably not a great idea unless it is something you are truly passionate about.

 taking on additional debt for a low paying job is probably not a great idea unless it is something you are truly passionate about.

Not a good idea even if you are passionate.  Passion doesn't put gas in the car or a roof over your head.  The principal purpose of a career is money unless you are some kind of a trust funder.

If the OP wants to stay in Michigan he can go the the University of Michigan and major in Naval Architecture and Marine Engineering. I don't think he has really looked at all the interesting options available to him.

RUN