Cost and overwhelming dislike from certain high ups in the chain of command. In total there were 3 spartan programs however. The 1st consisted of volunteer ODSTs and Marines which ended up failing. The 2nd is the Spartans we know and love from the game (and books). The entire program ended up costing so much the UNSC could have bought a battlegroup of ships. After the Spartan II's almost died off completely, except the Master Chief (or if you read the books there were about 4-6 other Spartans still left after Reach), a 3rd program started. The person most opposed to the original spartan programs ended up doing this one. Spartan III's had poor training and armor compared to their counter-parts but were better in their own ways. They were used as suicide troops to take out key covenant targets and were kept secret from the rest of humanity.
In essence the UNSC did train (create) more Spartans... just no one knows about it.
the didnt want the convention to create a more executive government
The Athenians had more money so they had better things, and more of. Sparta was worried most about war and didnt care about money and trades. Haylee, World History.
The Helots were the Spartans slaves. If the Spartans treated them well they would have been more likely to successfully rebel.
the spartans had more or less a country based on slaves, where everyone was strong and the slaves did all the work
pealeolithic people didnt have the abilities to domesticate animals and plants for their needs, they didnt know how to farm, make pottery, weave or create more advanced tools
they had more money
The original batch of Spartans were selected as children from their home worlds among the various human colonized systems. Most of their training was done aboard a UNSC vessel, where they were subjected to vigorous training many times more difficult than marine training today. Their bones were covered with a highly hardened metal to reduce and all but eliminate breaking problems. They were fed growth hormones and different brews of chemicals to increase reaction time and resistance to shock. Moomaster
Athenians were more into art, music, fun and drama, while Spartans had a very strict, military life stile.
Unfortunatly You Can Only Make 3 Spartans At One Time Other Than In Campaign.
They conquered more territory.
Spartans are much stronger and rely on their brute strength. On the other hand, Athenians are a much more logic based civilization.
No, ODST's (Orbital Drop Shock Troopers) are elite human soldiers. They are effectively the UNSC's Commando units and are used often in high secrecy or high priority missions, dropping from orbit behind enemy lines, allowing easy infiltration into enemy operations, thus giving them an element of surprise. Because of the danger of these missions, only the best soldiers in the UNSC can become ODSTs. They sport unpowered armour (that is to say, it gives them no extra strength). Spartans, however, are genetically altered superhumans which use powered armour, giving them much more added strength- along with energy shields and compatability with AIs. Spartans are highly experimental, and often go for a Brute Strength/Stealth approach to battles, deployed for very specific missions involving In-And-Out strategies - completing their mission with utmost speed and minimum casualties and complication.In short: No.