Final answer:
The City Beautiful movement was conceived for the Central Artery in the 1920s and aimed to improve urban planning and design.
Step-by-step explanation:
The concept of the City Beautiful movement was conceived for the Central Artery in the 1920s. This movement aimed to improve urban planning and design by creating larger park areas inside cities, building wider boulevards to decrease traffic congestion and add greenery, and developing suburbs to alleviate crowded city living. The movement had a significant impact on urban development well into the twentieth century.