Final answer:
The federal government played a significant role in the growth of the Sunbelt through policies and investments, particularly during the implementation of Johnson's Great Society programs.
Step-by-step explanation:
The federal government played a large role in the growth of the Sunbelt through various policies and investments. One of the major factors fueling this growth was the expansion of the tertiary sector industries, such as recreation and high-tech firms.
The federal government's spending and policies, especially during the implementation of Johnson's Great Society programs, contributed to the establishment of emerging information-based companies in the Sun Belt.