Over the past six decades, rapid population growth and shifting consumption patterns in the United States have significantly reshaped municipal solid waste (MSW) management, with population nearly doubling and MSW generation more than tripling between 1960 and 2018, driving higher per capita waste outputs and intensifying environmental pressures as economic development and urbanization expand both household and commercial waste streams. This study responds to the need to understand how long-term demographic and behavioral trends affect landfill reliance, recycling capacity, and sustainability outcomes by quantitatively examining nearly sixty years of national MSW data to evaluate relationships between population growth, total MSW volumes, per capita generation, recycling and landfill shares, and energy recovery through combustion. Using these historical data, this study develops linear regression models to forecast major waste streams through the year 2200, while imposing explicit constraints primarily capping the recycling and composting rate at 70% and fixing the combustion rate at 12.9% of total MSW generation, to keep long‑term projections within plausible technological and policy limits. The analysis suggests that resource recovery efforts continue to improve, with recycling and composting eventually reaching the 70 percent cap by the late 21st century, indicating substantial gains in diversion efficiency and processing capacity; however, the sustained linear growth in total MSW generation, driven largely by population expansion and rising per capita consumption, ultimately overwhelms these efficiency gains. The major finding is that even under optimistic recovery assumptions, the absolute tonnage of waste requiring landfill disposal is projected to rise sharply in the 22nd century, underscoring that improved management efficiency alone is insufficient and highlighting the critical importance of strategies that directly reduce waste generation through source reduction, material reuse, and systemic shifts in production and consumption