What was the government policy during 1920 and 1960 in Australia?

The White Australia Policy was a set of Australian government policies that restricted non-European immigration to Australia. Initially based on an informal and ad hoc approach implemented through administrative processes, it had its legislative basis enacted during World War II through a series of statutes and regulations aimed at preserving a European racial composition for post-war Australia. It remained core government policy until 1973, although it had gradually weakened from 1949 onwards.