Explanation: It was at the regional level that planning was used as a part of development policy by any country for the first time.

• It was the USA which started the first regional planning after the Tennessee Valley Authority (TVA) was set up in 1916—for a large-scale rehabilitation in south-eastern USA covering parts of seven states.
• The US experience of regional planning became such a success in realizing its well-defined goals that it emerged as a role model and an object of inspiration for many countries around the world in the coming decades—the Damodar Valley Corporation (DVC) in India (1948), the Volta River Project in Ghana (1966), etc.

Source: Ramesh singh