word bank: nullification, caucus, secede, suffrage, spoils system, pet bank, nomination convention, states' rights

Choosing presidential candidates became more democratic when political parties began to hold __________________ that included delegates from each state.

4 answers

We'll be happy to check what YOU THINK.
I think it's nomination convention.
If you are to choose one word, choose "conventions" -- plural, to fit the meaning of the sentence.
Majority