Final answer:
Ulysses S. Grant played a significant role in the Union's victory in the Civil War.
Step-by-step explanation:
One historical figure who played a significant role in the Union's victory in the Civil War was Ulysses S. Grant.
Grant, as the commanding general of the Union Army, implemented successful military strategies such as the capture of Vicksburg and the defeat of Confederate General Robert E. Lee at Appomattox Court House.
His leadership and determination were crucial in securing Union victories and ultimately bringing an end to the war.
Learn more about Union's victory in the Civil War