Answer:
1st blank: create a blockade at southern ports
2nd blank: more experienced military leaders
Explanation:
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Early in the Civil War, the North's strong navy helped it to create a blockade at southern ports.
Civil War can be regarded as a violent conflict which could take place between a state and one or more organized non-state.
However, during the civil war in United States, the the North's strong navy helped it to create a blockade at southern ports.
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