The strategies used by the Union during the Civil War included:
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naval blockade: The Union implemented a blockade of Southern ports to disrupt trade and supply lines.
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seizing control of the Mississippi River: The Union aimed to gain control of the Mississippi River to split the Confederacy and control a crucial transportation route.
The other options were not strategies used by the Union:
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defensive war: This was more characteristic of the Confederate strategy, as they primarily fought a defensive war to protect their territory.
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relying on European countries for supplies: The Union did not rely on European countries for supplies; rather, they aimed to cut off the Confederacy's access to foreign support.
Therefore, the correct answers are:
- naval blockade
- seizing control of the Mississippi River