Final answer:
The National School Lunch Act, the first national food supplementation program, was initiated in the year 1946 by President Harry S. Truman's administration.
Step-by-step explanation:
The National School Lunch Act was initiated in the year 1946. This Act was the first national food supplementation program in the United States, aimed at improving the health and nutrition of children in schools. The program was a major legislative achievement of President Harry S. Truman's administration and provided low-cost or free school meals to those in need.
Learn more about National School Lunch Act