I’m not an expert on the VISA/US tax or insurance, but you're making enough mistakes in terms of all the associated costs involved in owning and renting houses/apartments that this already looks potentially unwise at this stage of your investment career.
Renting cheap properties/to students involves the property constantly being trashed, often empty and require extremely close management (which you either have to pay someone a lot to do, or do yourself and lose other potential earning time. If doing yourself you will also make lots of mistakes in the vetting/managing/marketing process etc at first as this is a complex art in itself).
Deprecation in this type of rental can often get as high as 25% a year depending exactly how lucky you get even if you do it all yourself, and will typically be in the 5-15% range every year once everything you have to constantly maintain, replace and redecorate is totalled up. That's all pre what you could be earning in a job etc, so if you could earn a decent clip elsewhere in the same time also have to deduct that lost potential.
Send it all to third parties (so all upkeep by hired contractors, all renting by an agency) you will be lucky to even break even off ~15k a year rents to students.
You’re not seeming to price in any transaction costs, which usually run at ~5% a time for both entrance and exit. Thats between half and one years rent gone from the ten per property on these numbers. Sell before ten is up its even more.
On point three, rounding projections in house price rises to one decimal place is total gibberish – no one who actually has experience investing their own money well ever makes or relies on claims like this. No idea on Pittsburgh market but sound projections of likely asset changes is always a ranged and imprecise figure that cannot (and shouldn’t) be counted on for much. Even if it was, it’s also completely unattainable in property because you have to spend so much money on depreciation: post costs and changes in size/standard, house values generally roughly track inflation. Have a look at this chart and play around with some yearly depreciation numbers and you will see what I mean.
Renting property is an absolute graveyard for inexperienced investors and if you don't know the stuff above already (and it's less than 10% of what you need to know to do this profitably vs other uses of your time), you will nearly always be better off investing the money in more passive investments like diversified bonds, REITs and Stock.