I do not understand how you do not have a GPA. Do you have all A’s in your academic classes? Your SAT is very good.
As another answer has said there are many excellent universities in Canada. What do you expect to get by attending university in the US?
When you say “Ivies”, there are eight Ivy League schools. There are some other highly ranked universities in the US such as Caltech, Chicago, MIT, Stanford, … Do you have some specific schools in mind? Which ones do you think would be the best fit for you?
What would you get at U.Michigan that you would not get at McGill or Toronto or Queens?
Do you intend to continue to ride in college? Some top schools (Dartmouth College and Cornell come to mind) have equestrian teams. Apparently several others do too (Stanford, Princeton, …).
I would make sure that you apply to safeties in Canada. However, if you have nearly all A’s plus a 1540 SAT that might be essentially any university in Canada.