[rayiner]

> It's a highly "discriminatory" point based selection process, accepting almost exclusively educated and skilled candidates.

Judging by my family's experience, Canada's model is an excellent way to get lots of college-educated foreigners working retail service jobs. Just because the Canadian government assigns points for a Bangladeshi college degree doesn't mean Canadian employers do. The kids end up doing pretty well, but I'm not sure that's the intended function of the immigration system.

> considering it usually aims for immigrant diversity

An essential element of the U.S. system is family reunification. It encourages social stability by ensuring that immigrants usually already have a community and support network here.