With a conservative vision of Europe, the Austrian Count Richard von Coudenhove-Kalergi founded the Pan-Europa movement in 1923, hosting the First Paneuropean Congress in Vienna in 1926, and which contained 8000 members by the time of the Wall Street Crash. The aim was for a specifically Christian, and by implication Catholic, Europe. The British civil servant and future Conservative minister Arthur Salter published a book advocating The United States of Europe in 1933.