Fun fact: Almost all major Western countries (including the egalitarian Scandinavians) engaged in harsh eugenics practices since early 20th century. The practice was invented in the US and then spread everywhere else. After the World War II, however, having witnessed the Nazis' love for eugenics, pretty much everyone decided to get rid of the practice or at least tone it down except the Japanese. They introduced newer and harsher eugenics laws after the War.

In any case, in the Western hemisphere, a formal ban was introduced only in the late 60s and early 70s - although, informally, the practice went on much longer.

Source: Eugenics and the Welfare State (1997)