答案:【计分规则】: Before World War II, Canada used to have a racist immigration policy which actively discriminated against racial and religious minorities. After World War II, the Canadian government began to adopt a new policy to eliminate prejudice. Since then, Canada has opened its door to immigrants of all races and religions from any countries. At the end of the 20th century, a kind of anti-immigrant sentiment spread in Canada, and the federal government made changes to its immigration policy that decreased the number of immigrants allowed into Canada. Now, it is more difficult for people to immigrate to Canada.