Final answer:
The Ley 100, also called the Health Social Security Law, was implemented in Colombia in 1993 during César Gaviria's presidency to reform the health system.
Explanation:
Ley 100 in Colombia, also known as the Health Social Security Law, was established in 1993 during the presidency of César Gaviria. This law aimed to reform the country's health system by introducing a new model of health insurance and healthcare provision.
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