I know you are grossly undertaxing because you are. USA keeps lowering taxes because people will have "more money to spend to save the economy" or "companies can hire more people with saved money".
Of course, problem is that even if company hires more people it does not change a damn thing if there is nobody to buy the crap they produce. And if people buy crap they do not need and then crap they do not need from abroad, you guys are racking ever increasing deficit.
As for capital account, US capital account is not going to save you. Yeah, you guys receive lots of investments and your bonds are purchased. But unless USA switches to more healthy economical structure you guys are not going to live off it.
You only get money as long as people believe you can pay it back with sufficient profit margin to make it worth their time. Problem is, you guys do not grasp that more you loan and take money, more you have to pay back.
Well, actually you grasp it but you just prefer to ignore. Pretending that some miracle will save USA from bad financial handling.
It won't. Sooner or later investors start considering risks involved with US excessive spending and lack of measures to correct it a bigger risk than it is worth. And then you either stop receiving money or have to pay bigger interest. If you offer bigger interest, you just dig your hole way deeper. If you stop receiving money, your economy grinds to a halt and you guys default.
End of American dream.