Those Enclave people may have been defeated but there is no solid proof that there are not 100,000 men just outside the boarders of the map.
Yes there is. If you pay attention to Fallout 2. Fallout 2 tells us there is only the Rig and Navarro. The entire Enclave command was on the rig. The Rig went Boom!.
Fallout 3 tells us that Enclave from Navarro came to DC. There were no Enclave in the East till Fallout 3.
New Vegas tells us that, Navarro fell to NCR. Some stayed to fight. Others gave up and tried to start a new in NCR only to be hunted by them and the Brotherhood. So that means only some went to DC.
Enclave were to powerful in Fallout 3 due to the http://www.break.com/usercontent/2009/7/michael-bay-explosions-821047 The Enclave in Fallout 3 cause very big plot holes.
Canon wise the Enclave are gone in the West and were destroyed twice in Fallout 3. The only enclave place left is outside Chicago. An outpost/relay station. They are remnants now. There arn't a 100,000 just over the next hill.
Enclave are gone: http://www.youtube.com/watch?v=vHGRcdq0x9A, http://www.youtube.com/watch?v=TIh0jizPP6c http://www.youtube.com/watch?v=khv6Pa7Ph00.