The post world war 2 time period is referred to as the “era of development”
Former US president Harry Truman is often credited as the first person to define modern development:
“We must embark on a bold new program for making the benefits of our scientific advances and industrial progress available for the improvement and growth of underdeveloped areas. The old imperialism – exploitation for foreign profit – has no place in our plans. What we envisage is a program of development based on the concept of democratic fair dealing”