<p>The above from Stanford is inapplicable to ED because Stanford does not have ED but only non-binding EA.</p>
<p>Under ED, you are required to accept admission and withdraw “all” other applications if accepted. That includes applications to foreign institutions.</p>
<p>As a practicable matter, the ED school cannot really do anything to you if you choose not to attend and go to a foreign college. If you later apply to grad school to it, it will still likely have a record of your breaking the ED agreement and could consider that against graduate admission. However, it will have no impact on any other college. </p>
<p>Nevertheless, if you want to be perceived as a person with integrity do not apply ED to a college unless your intent is to attend at the exclusion of all other colleges</p>