For Churchill, the entry of the United States into the war was the "greatest joy". He felt that Britain was now assured of victory, but failed to recognise that the "many disasters, immeasurable costs and tribulations [which he knew] lay ahead" in December 1941 would have permanent consequences for the future of the empire. The manner in which British forces were rapidly defeated in the Far East irreversibly harmed Britain's standing and prestige as an imperial power, including, particularly, the Fall of Singapore, which had previously been hailed as an impregnable fortress and the eastern equivalent of Gibraltar. The realisation that Britain could not defend its entire empire pushed Australia and New Zealand, which now appeared threatened by Japanese forces, into closer ties with the United States and, ultimately, the 1951 ANZUS Pact. The war weakened the empire in other ways: undermining Britain's control of politics in India, inflicting long term economic damage, and irrevocably changing geopolitics by pushing the Soviet Union and the United States to the centre of the global stage.