Final answer:
The first modern health insurance became an employment benefit due to the advantages it provided for both employees and employers.
Step-by-step explanation:
The first modern health insurance became an employment benefit because employers realized it provided several advantages for both the employees and the company. For employees, having health insurance as a benefit meant that they had access to medical care without having to pay the full cost out of pocket. Employers, on the other hand, benefited from offering health insurance as it helped attract and retain talented employees, increased productivity, and reduced employee turnove