In what main way did steam-powered warships and merchant ships affect empire building in the 1800s?
the ships gave imperialist nations more power
the shops gave imperialist nations greater military power
the ships required far-flung bases for refueling and resupply
the ships required industrial know-how to design and build

The correct answer is the ships required far-flung bases for refueling and resupply.

Explanation:

During the Industrial Revolution, many things were improved in the steam engine, meaning that it was one of the most important technologies. This engine started to be used in many different fields and not only in mining. The steam engines improved both productivity and technology; in the case of the warships and merchant ships, the steam engine provide the opportunity of increasing distances, so letter C is the correct answer.

b. ensure mutual protection from communism.

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a. favoring native born americans over immigrants.