Final answer:
The radical Republicans incorporated African Americans into the economic and political world by extending voting rights to Black men.
Step-by-step explanation:
The radical Republicans aimed to incorporate African Americans into the economic and political world by extending voting rights to Black men (C). This was achieved through the passage of the Fifteenth Amendment to the United States Constitution in 1870, which prohibited the denial of the right to vote based on race or color.
This allowed African American men to participate in the political process and have a voice in the decision-making processes at local, state, and national levels.
By having the right to vote, African Americans could effectively advocate for their economic and political interests, paving the way for increased equality and representation.
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