Final answer:
The 1920s era agreement aims to implement 'cultural landscapes', reflecting cultural forces of a place and can evolve over time due to factors like cultural diffusion and assimilation.
Step-by-step explanation:
The original 1920s era agreement is an attempt to implement the concept of cultural landscapes. A cultural landscape is an area that has been altered or shaped by human involvement, reflecting the cultural forces specific to a place, such as religion, language, ethnicity, and heritage. These forces influence societal norms and can be seen through the symbolism depicted in the landscapes' colors, sizes, and shapes. Over time, these landscapes are subject to change due to various factors, including migration, trade, and cultural diffusion, which is the spread of cultural traits from one region to another. Assimilation might also occur, which is when a subordinate culture conforms to the dominant one, often losing its distinctive traits in the process. However, sustainable development, the idea of maintaining a balance that ensures continuity from one generation to another, also integrates cultural elements but focuses on ecological and communal wholesomeness rather than cultural change.