Answer:
The progressive movement was responsible for creating the progressive party, which was the party responsible for launching Roosevelt's candidacy for the post of president of the republic.
Step-by-step explanation:
Roosevelte was one of the leaders of the progressive movement, long before he was elected president of the republic. His leadership in this movement was so remarkable that it allowed him to be the candidate to represent that movement in the presidential elections, through the creation of the progressive party that managed his entire presidential campaign.