Which theory states that peace results when several states use national power and alliances to stabilize one another,blocking would-be expansionists?

Question

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The balance-of-power theory asserts that peace can be achieved when several states use alliances and power to stabilize one another, primarily by preventing the expansion of any single state. The theory suggests that if too much power is concentrated in one state or a small group of states, it can destabilize the system and lead to conflict.

Which Theory States That Peace Results When Several States Use