Why was Roosevelt's policy called the "Big Stick" policy?

Big Stick policy, in American history, policy popularized and named by Theodore Roosevelt that asserted U.S. domination when such dominance was considered the moral imperative. Roosevelt’s first noted public use of the phrase occurred when he advocated before the U.S. Congress increasing naval preparation to support the nation’s diplomatic objectives.

these civilizations were located around fertile rivers, where they could produce an abundance of crops

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