Which early civilization had well organized unifed empire with an elaborate system of roads covering more then 10,000

Bridges of stone or reeds were also constructed to cover distances in a more direct route as ... There was even an appointed official, the Chaka Suyuyuq, responsible for inspecting the empire's bridges. Inca roads are very often more elaborate & well-constructed than was Alden Mason, J. The Ancient Civilizations of Peru.

The Incas, hope this helps

that is because lower interest rates allowed people to work harder to make money. it multiplied like that and now the uno(not the game) is very strong.

i like trains

1st and 3rd : ) now lemme smash