Why were ancient Greece and Rome such successful empires?

they were successful because of all of their scientific discoveries and military advancements

Greek culture is what was successful. It's push for science, education, philosophy, and innovation were all highly prized by other people they came into contact with. It was an organized and sophisticated society bent on continuous learning and illumination.

Governing the Empire. In order to control their large empire, the Romans developed important ideas about law and government. They developed the best army in the world at that time, and ruled by force. They had fine engineering, and built roads, cities, and outstanding buildings.

Explanation:

George Curry (April 3, 1861 – November 24, 1947) was a U.S. military officer and politician. He was governor of New Mexico Territory from 1907 to 1910, and once it became a state he represented it in the 62nd United States Congress. Curry County, New Mexico is named in his honor.