Why did emperors have places like the circus Maximus or trajan’s marketplace built

The Circus was Rome's biggest setting for ludi, public games associated with Roman strict celebrations. Ludi were supported by driving Romans or the Roman state to help the Roman public (populus Romanus) and divine beings. Most were held every year or at yearly stretches on the Roman schedule. Others may be given to satisfy a strict promise, for example, the games in festival of a victory.

In Roman custom, the most punctual victorious ludi at the Carnival were promised by Tarquin the Pleased to Jupiter in the late Glorious period for his triumph over Pometia.

Explanation:

The circus Maximus (Latin for most noteworthy or biggest carnival; Italian: Circo Massimo) is an old Roman chariot-dashing arena and mass diversion scene in Rome, Italy.

In the valley between the Aventine and Palatine slopes, it was the first and biggest arena in old Rome and its later Domain. It estimated 621 m (2,037 ft) long and 118 m (387 ft) in width and could oblige more than 150,000 spectators. In its completely evolved structure, it turned into the model for carnivals all through the Roman Empire.

there were 6 major base camps.   the base camps were located in alva, fort reno, fort sill, the madill provisional internment camp headquarters, mcalester and camp gruber.