What is a caucas? who holds the first one?

Caucus is a meeting held by supporters of a specific political party. This term was originated in the United States of America. Later other countries adopted the method as well. The first caucus was held in Iowa.

Explanation:

Caucus is a meeting held independently by a group of followers to discuss the ongoing strategies. They brainstorm ways which will benefit the party. Local members of the community help.

This system has been proven beneficial for the political parties.

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.