Married couple will fly to Mars and find nationalistic dictatorship-run beings

George Griffith : sci-fi writer
A Honeymoon In Space (1900): "Captivating story of a Richard Branson type Englishmen, who marries an American girl, who then explores the solar system. They find evidence of past civilizations on the Moon, and then visit Mars. On Mars, they find a race of nationalistic dictatorship-run beings, who are war like and dangerous. Further explorations are taken."