Daladier supported Chamberlain's policy of creating a "peace front" that was meant to deter Germany from aggression but was unhappy with the British "guarantee" of Poland, which Chamberlain had announced to the House of Commons on 31 March 1939. France had been allied to Poland since 1921, but Daladier had been bitter by the German-Polish Nonaggression Pact of 1934 and the Polish annexation of part of Czechoslovakia in 1938. Like other French leaders, he regarded the "Sanation" regime ruling Poland as a fickle and unreliable friend of France. The rise in French industrial output and the greater financial stability in 1939 as a result of Reynauld's reforms led Daladier to view the possibility of war with the "Reich" more favourably than had been the case in 1938. By September 1939, France's aircraft production was equal to Germany's, and 170 American planes were arriving per month.