What is a cancus and what events led to its demise as a method for nominating candidates?

A caucus is a meeting of members of a political party or faction to discuss and select candidates for elections or to make decisions on policy issues. The decline of caucuses as a method for nominating candidates was influenced by a push for greater transparency and inclusivity in the political process, leading to reforms such as the introduction of primaries. Additionally, the increasing complexity and time commitment required for caucus participation made them less appealing to voters, ultimately resulting in a shift towards more straightforward voting methods like primaries.