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So let's suppose the US had been more expansive and aggressive in acquiring lands.
-Backs Filibuster William Walker in Sonora and Baja California,and annexes them. (That or it just buys them up in the Gadsden purchase)
-Backs Filibuster John A. Quitman in Cuba and annexes Cuba (Or it just buys it at one point or another)
-It votes to incorporate Santo Domingo as a state in 1870
-It keeps North Borneo in 1865 and Liberia in 1867 as bases and coaling stations
-It keeps the Falklands as a territory in 1832