From what I've read over the last year or so......
Originally ISIS came across the border from Syria into Iraq. In Syria they were called the "rebels" and the poor things were fighting the evil Assad government (whoops, I should say regime) and had been doing so for at least a couple of years. Assad was evil of course because he preferred to deal with the Russians and not the west. There were thousands of them using nice new weapons and ammo, plenty of food, backup, they even hosted embedded journos who forgot to ask them where their weapons came from. Funny about that.
Most weapons came from the USA, or US sponsored countries. I read somewhere that in some cases the US (CIA?) even sold them some Russian made weapons. Again, the MSM avoided mentioning any of this so when these rebels went across the border into Iraq and became ISIS the MSM simply said all the weapons were taken from the Iraqi military as they fled.
There are plenty of links around for all this, including some specific cases of the US topping them up with heavier stuff such as grenade launchers and missiles etc.
Where did the money come from to pay for all this. Apparently from Qatar and Saudi Arabia, but again the MSM was not allowed to mention it.
Training was in Turkey with US help (CIA?). I've got the links but I'll drag them out if I get challenged LOL.
Well, most of that was well known if you've been following along for a while. What got my attention a couple of weeks ago was that some Hamas leaders had left Gaza and gone to back to their headquarters, in Qatar of all places!
What a mess. So the US is backing the Saudis and Qatar for fear that they could derail the status of the petrodollar if they were disappointed, while all the while knowing that they are looking after Hamas.