Alpha Sigma Phi survived World War I fairly easily and even recruited many new members during those years. In the post-war era, Alpha Sigma Phi expanded at the rate of one chapter per year. In 1939, Phi Pi Phi merged with Alpha Sigma Phi, as the Great Depression left that fraternity with only five of its original twenty-one chapters. World War II hit Alpha Sigma Phi hard, with many brothers losing their lives due to the conflict, forcing many chapters to close.