Who did the United States defeat in a late-nineteenth century war that was fought in the area shaded in green here?

The Battle of Thermopylae was fought between an alliance of Greek city - states, led by King ... However, the following year saw a Greek army decisively defeat the ... the Spartans had arrived too late at the Battle of Marathon because of this ... Leonidas replied, " Won 't it be nice, then, if we shall have shade in which to fight ...