In the early 1950s, the historian Frederick Wood explained the choices forced upon Australia and New Zealand by British decline. Previously, he said, “we took for granted the naval and economic strength of Great Britain, and on that twofold foundation we built free and prosperous countries.” But this British pre-eminence no longer existed; America was the dominant military and economic power. Britain’s decline led to what he called the “Anzac dilemma.” Australia could be forced to choose between the British Commonwealth and the United States. The dilemma was masked when Britain and America stood together but, if they seriously diverged, “the results for the Pacific Dominions would be calamitous.”