In 1936, Germany remilitarized the Rhineland in defiance of the Versailles Treaty. Without the support of Britain or Italy, France declined to intervene to prevent the remilitarization. In March 1938, Germany peacefully annexed Austria. That same year, Germany demanded the annexation of German-speaking parts of Czechoslovakia. In a last desperate effort to keep the peace, Britain and France agreed to German demands with the September 1938 Munich Agreement. Roosevelt supported Britain and France, and insisted on American neutrality in Europe. In March 1939, Hitler flouted the Munich Agreement by occupying the remaining portions of Czechoslovakia. In response, the British announced their commitment to defending Poland, which many assumed Hitler would attack next.