This essay provides a comprehensive overview of the history of immigration in Australia, beginning with European settlements and the evolution of the migration system. It details the shift from the White Australia Policy to multiculturalism, highlighting key reforms and agreements that shaped the country's demographic landscape. The essay discusses the introduction of structured selection based on skills and attributes, replacing the quota system, and the establishment of Australia as a multicultural society. It also addresses the criticisms faced by Australia regarding immigration detention practices, particularly the indefinite detention of asylum seekers, and the concerns raised by international organizations like the United Nations and Amnesty International. The essay concludes by suggesting potential solutions to address the issue of immigration detention, such as setting time limits for assessment and improving detention facilities, to ensure a fair and just immigration system.