My 2000 Ford Contour shakes really badly when it gets above 60 mph.
Take it to a shop immediately. Do not pass go, do not collect $200.
There could be any of a number of things wrong, but that is generally a very bad sign for safety’s sake - you could have balljoints just about to fail, and you don’t want to experience your wheel snapping off at 60 mph.
Luckily, most of the things that cause that sort of a symptom aren’t really that expensive to fix, so get it in to a shop right away.