Answer:
1. More cleavages in society, means there are more interests
2. the american constitutional system has brought about an increase in interest groups because it gives them more rights to the government if they are an interest group.
3.interest groups have risen significantly gaining recognition because the political parties in the United states during the 60s &70s was weak.
Step-by-step explanation:
Interest groups during the 70s thrived because the were operating with so much liberty.
An interest group is a voluntary membership association organized to pursue a common interest through political participation.
Most people form interest groups in order to increase the chances that their views will be heard by the government in the process influence government decision.