Why did the flu pandemic begin to die out?

The flu pandemic began to die out due to a combination of factors, including the development of herd immunity as more people became infected and recovered, thus reducing the virus's ability to spread. Increased public health measures, such as social distancing, mask-wearing, and vaccination campaigns, also played a crucial role in controlling transmission. Additionally, the virus often mutates over time, leading to less virulent strains that are easier for populations to manage. These factors collectively contributed to the decline of the pandemic's impact.