The United States spends more money per capita in healthcare than any country in the world, and 2-3x as much as most European welfare states. There are a lot of problems with the system, but "not enough money funneling into it" is not one of them.
The US government still spends more on healthcare as a total amount per person (about $1.4T, or $3,880 per person, just for medicare+medicaid), compared with the UK (about $3,300 per person)
The US as a whole in 2019 spent 16% of its GDP on Health, 4% on Military
The UK meanwhile spent 10% on Health and 3% on Military
Have you been to a doctors office in the US? There are more administrators filling out insurance papers than doctors. US spends money on healthcare administration, not on healthcare. The same dollar in the US buys ten times less insulin than a dollar in Canada.
