Man didn't. God gave it to him.
You do know that Sanders proposed plan goes far beyond what those other countries plans cover right? Still think it can be done for the same price? The nursing home portion alone would be extremely expensive. Simply claiming other countries vs. Sanders plan IS NOT COMPARING APPLES TO APPLES.
https://www.commonwealthfund.org/blog/2019/universal-health-coverage-eight-countries
First, many of these proposals would impose no patient cost-sharing. This is in contrast to Scandinavia, where patients pay copayments for most services. Norwegians pay $17 (U.S.) for primary care visit, $39 for specialist visits, and up to $51 for prescription drugs. At the same time, total annual out-of-pocket spending is capped at $221 per year (as of 2017), after which services are free; also, vulnerable populations such as children and pregnant women are exempt from most cost-sharing. Even in countries where physician and hospital services are free, such as the U.K. and Canada, patients pay some portion of prescription drug costs.
Second, the single public plans that have been proposed in the U.S. so far would provide everyone with a wide range of benefits, including vision, dental, and long-term care. Most countries with universal coverage, however, cover vision and dental benefits only for targeted populations such as children and low-income adults. Similarly, long-term care is not typically covered. Instead, these services are financed separately, whether through national long-term care insurance or local taxes.