After the Confederate purchase of the northern Mexican provinces of Sonora and Chihuahua, which extends the CSA-USA border and gives the Confederates a Pacific port (Guaymas), the United States declares war on the Confederacy.
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The United States receives some good news when a young volunteer cavalry colonel, Theodore Roosevelt, and George Armstrong Custer rout a British division under Charles Gordon invading Montana from Canada.
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In this timeline's New York City, there is no Statue of Liberty on Bedloe's Island, nor does the name get changed to Liberty Island – as relations between the United States and France are poor, due to France's support for the Confederacy, and there is no question of the French donating such a statue to the Americans.
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Turtledove's model in our history was evidently the French desire for revenge on Germany ("Revanchism") following their defeat in the 1871 Franco-Prussian War and the loss of Alsace and Lorraine.
We Who Are Alive and Remain | We Shall Remain (documentary) | We Shall Remain | The Strange Remain | '''''Spontaneous symmetry breaking simplified''''': - At high energy levels ''(left)'' the ball settles in the center, and the result is symmetrical. At lower energy levels ''(right)'', the overall "rules" remain symmetrical, but the "Mexican hat | Reroute to Remain | It Takes a Fool to Remain Sane |