Final answer:
The number and scale of interest groups at the national level has increased over the past several decades. Factors such as advancements in technology, increased specialization of industries, and the devolution of power to state governments have contributed to this increase.
Step-by-step explanation:
The number and scale of interest groups at the national level has increased over the past several decades. There has been a tremendous increase in both the number and type of groups. This increase can be attributed to various factors such as advancements in technology, increased specialization of industries, and the fragmentation of interests. Additionally, the devolution of power to state governments has led to an increase in the number of interests targeting their lobbying efforts at the state level.