Which is an example of a sphere of influence?
a nation is politically independent, but an imperial power controls its trade.
a nation is under complete political and cultural control of an imperial power.
a nation is protected by an imperial power in return for trade privileges.
a nation forms an alliance with an imperial power, and both reap benefits.

A nation is politically independent, but an imperial power controls its trade.

Explanation:

A sphere of influence or zone of influence is an area or region in which an organization or state exercises a certain kind of indirect cultural, economic, military or political domination. Also, in some inhabited places, it is spoken of area of influence to designate the space in which, for example, a trade or service has influence on localities or other zones different from which they are located.

explanation:

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in 1859, brown and 21 of his followers attacked and occupied the federal arsenal in harper's ferry. their goal was to capture supplies and use them to arm a slave rebellion. brown was captured during the raid and later hanged, but not before becoming an anti-slavery icon. abolitionist and insurrectionist

explanation: