It's exactly as the title, who do you think 35% refers to? And those making 450k aren't rich Americans? Because they are referred to separately.
So I still didn't see where you were getting the $450k number and since you didn't want to tell me where you got it, I did a little googling. Turns out that $450k number is what OBAMA agreed it was with congress in January 2013(and it was for married filing jointly) That's the threshold. You made $1 more and you're considered rich. So if you want to blame someone, blame YOUR president, Obama.