Economic Prosperity: The late 20th and early 21st centuries saw periods of economic growth and relative affluence in the United States. As people's incomes increased, there was a greater demand for larger and more luxurious homes.

Social Status and Prestige: McMansions were often seen as status symbols, reflecting the homeowner's success and affluence. Many people aspired to own these large homes as a way of showcasing their social and economic standing.

Suburban Sprawl: The development of McMansions was closely tied to suburban sprawl, where large tracts of land on the outskirts of cities were developed for housing. These homes were often built on oversized lots and were part of planned communities with amenities like golf courses and clubhouses.

Cookie-Cutter Design: McMansions are often criticized for their lack of architectural uniqueness. Many of these homes feature generic and formulaic designs, leading to a sense of homogeneity in suburban neighborhoods.

Desire for More Space: Homebuyers were drawn to McMansions because of the promise of more space. These homes typically have multiple bedrooms, bathrooms, and large living areas, catering to the desire for ample room for families and possessions.

Real Estate Trends: At the peak of their popularity, McMansions were seen as good investments due to the rising property values. Many people bought them with the expectation that they would appreciate in value over time.

Customization and Amenities: McMansions often included features like granite countertops, vaulted ceilings, and walk-in closets, appealing to buyers who wanted modern conveniences and luxurious amenities.

Changing Aesthetics: Many people began to find the excessive size and gaudy designs of McMansions unappealing, preferring more modest and aesthetically pleasing architectural styles.

Environmental Concerns: The large size and energy inefficiency of McMansions came under scrutiny as environmental concerns grew. Smaller, more sustainable homes gained favor among eco-conscious buyers.

Economic Factors: The economic downturn of the late 2000s, known as the Great Recession, had a significant impact on the real estate market, making McMansions less affordable and desirable.

Lifestyle Changes: As demographics and lifestyles evolved, there was a growing trend toward smaller households and a desire for more walkable, urban environments rather than large suburban homes.