Final answer:
The major reason why the United States spends more on health care than any other country is due to a proliferation of 'high-tech' medical interventions.
Step-by-step explanation:
Some researchers believe that the major reason why the United States spends more on health care than any other country is due to a proliferation of 'high-tech' medical interventions. These interventions refer to advanced and expensive medical treatments, procedures, and technologies used in the United States that may not be as prevalent in other countries. These high-tech medical interventions often come with high costs, contributing to the overall higher spending on health care in the United States.