Having had my sleep interrupted by a toddler bed wetting situation, I just spent 2 hours typing a novel about the human condition on my phone rather than sleeping, and then slipped and accidently swiped "refresh". Long story short, the reason why Americans buy excessive amounts of consumer goods is because they can and have for 3 or 4 generations and it's culturally normal. There's fleeting happiness from the small reward of dopamine in your brain from spending money, and an economy optimized for it built on top of unprecedented abundance since the late 1940's.
A lot of Americans are uninformed about quality, and are well enough off not to need to be. As an extreme example, a few weeks ago my young nephews were really excited because a "$400" drone was "on sale" for only $100 in limited quantities! "Daaaadddd we HAVE to buy it. We'll use our own money!" Luckily I was there and, as their uncle, have no problem crushing their hopes and dreams. I work on autonomous aircraft professionally, so it was pretty easy to explain thoroughly and painfully (for them) why it was junk. I made it a point for them to understand that despite the fact that they had the money, they couldn't really afford to buy it. If they did, they would have fun for about 90 seconds until it crashed and broke, and then they would have a pile of e-waste and no money.
Adults are generally wiser than children, but still frequently irrational (not to imply that that's a bad thing). My wife orders and returns clothes often times as a way to cope with stress and anxiety. It's several orders of magnitude cheaper and easier than therapy (which is a rather unfortunate state for our society), and her experiences as a child led to her developing a scarcity mindset. She also hates clutter, and will tend to either pack things away never to be seen again or readily throw things away on a daily basis.
I'm fairly opposite. I rarely buy clothes; the average age of any item of clothing I own is probably 10 years. I'll hand sew holes to keep my favorite shorts on life support. My experiences as a child lead to developing an abundance mindset. I appreciate order but don't mind clutter, and like to know I can find something within 10 minutes of looking, even if it's been a few years, because it's exactly where I left it. I don't throw things away without some premeditation, because I bought it with some premeditation.
We have fun together!