Answer:
c
Explanation:
because its stronger than others
The Erie Canal is a canal in New York and connects the Great Lakes with New York. Railroads and canal benefit shipping goods because it is faster instead of going by wagon or horse
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The monarchy and the autocracy both have a head. The head is one of the powerful group. As they continue as leaders they would become a stronger group altogether. So basically one leader of the two groups that controls everything and is the most powerful one.