Leo's forward-looking approach encouraged Catholic Action in other European countries where the social teachings of the Church were incorporated into the agenda of Catholic parties, particularly the Christian democratic parties, which became an acceptable alternative to socialist parties.
Pendekatan Leo yang memandang ke depan mendorong Aksi Katolik di negara-negara Eropa lainnya di mana ajaran sosial Gereja dimasukkan ke dalam agenda partai-partai Katolik, khususnya partai-partai Kristen demokratis], yang menjadi alternatif yang dapat diterima bagi partai-partai sosialis.