What is the result of Americans' tradition of joining interest groups?

a large number of interest groups of all sizes

Explanation:

Obtaining a support from an interest group will massively increase the chance of a government candidate to win the election. These groups provided the candidate with funding that can be used for their campaigns. In return, the interest groups will ask the candidates to create legislations on their behalf when they're elected

Because of this, many candidates affiliated themselves with interest groups to obtain their position. As a result, a lot of interest groups with their own different interests started to obtain a lot of control within the government.

i think you really need to revive you answer! : d