A 'bloc' often shares ideology or goals, and can influence international relations. NATO is a bloc of countries dedicated to mutual defense.
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Historical Context
'Bloc' can refer to historical groups, understanding the history helps grasp its meaning. The Western Bloc opposed the Eastern Bloc during the Cold War.
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Collective Power
A 'bloc' can amplify the influence or power of its members more than if they acted alone. The African Union acts as a bloc to advance the continent's interests.