In order to keep political party bosses from controlling which candidates were chosen to run for office, Progressives pressured state legislatures to call for

Primary Elections

Explanation:

Prior to 1912, party bosses called the shots as to who was fronted for elections in the party. But after the Progressives party was formed in that year, they highlighted the fact that this type of nomination by the bosses was not representative of the people's choice.

So they proposed the start of primary elections which would involve a lot of people from the public in choosing a candidate who would represent the party in the presidential elections.  

so they can differentiate themselves from others as they saw themselves as the superior race. the star was basically a symbol that meant you are a less of a person than i am because of my race. the star was also degrading for those who had to wear it because they were aware of this and the nazis used the notion to make them feel less like a person.

the anwser is a) to prevent military conflict