What act was passed in 1923 to restrict Chinese immigration?

The act that was passed in 1923 to restrict Chinese immigration is the Chinese Exclusion Act. This legislation was specifically designed to prohibit Chinese immigrants from entering Canada, marking a significant and discriminatory measure in the country's immigration history. It reflected the widespread anti-Chinese sentiment and racial discrimination prevalent at the time. The act was a culmination of previous restrictions and aimed to reduce the already minimal Chinese presence in Canada by effectively barring all Chinese individuals, with very few exceptions. This significant legislative move had lasting effects on Chinese communities and immigration policies in Canada until it was repealed in 1947.

The other options are related to immigration but do not specifically address the restrictions on Chinese immigrants. The Immigration Act generally covers broader immigration policies, the Refugee Protection Act pertains to the protection of refugees, and the Multiculturalism Act promotes diversity and inclusion within Canadian society, rather than imposing restrictions.