Final answer:
Frederick Olmsted believed that American cities should have large parks for recreation and quiet reflection.
Step-by-step explanation:
The landscape designer who believed that America's cities should have large parks for recreation and quiet reflection was Frederick Olmsted. Olmsted was a key figure in American landscape architecture and is best known for his design of Central Park in New York City. He believed that large parks were essential for the well-being of urban communities, providing spaces for relaxation, physical activity, and communion with nature.
Learn more about Frederick Olmsted