Top Ten Longest Lasting Nations (Afterall)

Number Ten First Empire of Saturn (69 Years)
The First Saturnian Empire was formed in 2184, it would go on to dominate the outer Solar System for decades util the Saturnian-Plutonian war which caused them to lose their grip on the outer Solar System and eventually lead to its demise in 2256 when it was reformed into the Second Saturnian Republic.

Number Nine Republic of Titan (71 Years)
The Republic of Titan was formed in 2234, after fighting a three year war of independence against the Saturnians, it would go on to support Pluto in the Saturnian-Plutonian war, it would go into a golden age, however due to its size, and weakspot in the Solar System the Republic was annexed by the Second Saturnian Empire in 2305.