Why would the US not have enough money for health care for all its citizens? Is the US poorer than other Western nations?

Update: Countries in the EU have open borders and universal health care. Not sure I understand the connection. Please elaborate.
Update 2: Claiming equity because of ER access is fiscally irresponsible. I don't want my tax dollars paying for people to get their paps and mammograms in the ER. Do you?
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