Question

How state/regional parties contribute to strenghthen democracy?

Answer 1

They strengthen federalism in following ways:-

1)They provide variety of choce to people as they each have different agendas and focus on seperate issues.

2)They  provide a platform for different pressure and social groups and communities to put forward their demands.

3)They help in power sharing by sharing power of government with the help of coalition government.

Some examples of them are Janata Dal United, Sikkim Democratic Front etc.(you may add ur own if u want)
Hope this helped and please give a thumbs up in return :)

Hope it's helpful for you. mark me in brain list answers.