hey there,
i don't know if there are any patterns to which u.s. schools accept canadians but i think in general the more well-known private schools are more accepting of canadian and international students. in most cases (from the research i've done), the lesser-known state schools are harder for foreigner's to get into because they set very small quotas for students who are not residents of the particular state and/or who are not u.s. citizens or permanent residents etc.