What are the biggest sectors in the US economy?

Is it just me, or is it kinda crazy how HUGE the healthcare sector is in the US? I was looking at the biggest parts of our economy the other day, and bam – health insurance and hospitals are right up there. It's a little unsettling, you know? Like, good that people can get care, of course! But seeing how much money is involved… it makes you think. Are we really focused on preventative care and keeping folks healthy? Or is it more about, well, profit? I remember my aunt, bless her heart, she had this insurance runaround for months trying to get a simple procedure approved. It makes you wonder if the system is designed to help people, or… something else entirely. I mean, I read somewhere that healthcare spending in the US is way higher than in other developed countries, but our health outcomes aren't necessarily better. Makes you go, "Hmm, something's not quite right here," doesn't it? It's a complicated issue, for sure.