To cast doubt on the truth of Harriet Tubman's retelling of her own life, you might ask: "What evidence exists to support or dispute Harriet Tubman's accounts of her experiences in the Underground Railroad?"
To show that many people shared a high opinion of Harriet Tubman, you could ask: "How did contemporary figures and historians evaluate Harriet Tubman's contributions to the abolitionist movement?"
To convince readers that Harriet Tubman was a real person, a relevant question might be: "What documentation or records exist that confirm Harriet Tubman's life and achievements?"
To argue that Harriet Tubman should have been awarded a military pension and a medal, you could ask: "What criteria were used to grant military pensions and medals during Tubman's time, and how did Tubman’s contributions align with these criteria?"
Each of these questions serves a different purpose and targets a specific aspect of Harriet Tubman's life and legacy.