Social media addiction didn't come around until about 2008 - and even then it took a few years to become widespread. Trump being elected twice isn't the cause of the decline, it's a symptom of it. The GWOT is one cause among many, but probably the one that pushed things over the edge. It led to both Iraq and Afghanistan wars which cost $Trillions that we borrowed and still haven't paid off. Not to mention the lost lives on all sides and further destabilization of the ME. Our over-reaction to 9/11 was the terrorists' dream. It's hard to imagine an outcome that would've been better from their perspective if their aim was to weaken and destabilize the US.