Yup apartheid SA. I wouldn't say impose creationism... evolution was just downplayed or left out of the curriculum.
The teachers that should have known better(IE) as educated educators used other subjects times to take cheap shots at evolution. In some sense considering it their religious duty to warn the masses.
I guess I should count myself lucky then, even in my country full of Catholics, evangelist and Jehovah witnesses, I never heard about creationism once in school, I was always taught science and Darwinism.
I did hear about creationism on biblical class but that was not in school, my mom took me there every Saturday but I usually escaped until she stopped bringing me there altogether lol