How did both the construction of roads and the Mediterranean Sea contribute to the expansion of the Roman Republic?

Both provided protection from foreign invasion.
Both allowed for the easier movement of troops.
Both eased the occupation of territories north of the Alps.
Both connected Rome to newly acquired African territories.

The answer is B: Both allowed for the easier movement of troops

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b

Explanation:

an effect of the steamboat's popularity was that people began building canals in the united states and europe. this was done to find another way to transport goods across the country and in that time, transportation using the river was very slow and dangerous. it depended entirely on manpower and the current of the river. that all changed in the late 1700's when steamboats were introduced. they soon revolutionized travel and trade through the river and dominated the waterways. eventually, other means of transportation took over from the steamboats, but there was a time that they the united states to expand to the west.

1920's

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explanation: