Political and strategic motives
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National prestige: In the era of intensifying European nationalism, colonies were treated as markers of national greatness. "The sun never sets on the British Empire" expressed pride in colonial scale.
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Balance of power: If France seized colonies, Britain felt compelled to seize colonies. Germany unified late and demanded "a place in the sun." Italy unified late and resented being shut out of the Mediterranean. National competition fueled the scramble.
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Military and strategic positions: Coaling stations for steamships, naval bases, control of strategic waterways (Suez Canal, Strait of Malacca, Panama Canal). Britain controlled the Mediterranean route to India through Gibraltar, Malta, and Suez.
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Preemption: Powers often seized territory primarily to prevent rivals from doing so.