Why are tall buildings less stable then short buildings?

Tall buildings are generally less stable than short buildings mainly due to their increased height-to-width ratio, which makes them more susceptible to lateral forces like wind and seismic activity. As the height increases, the structure must counteract these forces, requiring more complex engineering and materials to maintain stability. Additionally, taller buildings experience greater sway, which can lead to structural fatigue if not properly designed. Overall, the dynamics of gravity and wind load become more challenging as the height of a building increases.