Final answer:
The Frankfurt Assembly's main goal was German unification, but it failed due to opposition from German leaders and challenges in deciding on incorporating certain German-speaking areas.
Explanation:
The Frankfurt Assembly failed to achieve German unification. The all-German parliament convened via universal manhood suffrage in Frankfurt aimed to create a unified German nation but faced opposition from many German leaders, leading to the movement's failure. The challenge of including German-speaking areas like Austria and Prussia also hindered the assembly's efforts.
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