Why is the admission rate for international applicants much lower?

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<p>That bolded part I found confusing for me when I first saw it. Thing is, in Australia (and I suppose other countries in the southern hemisphere), our school year runs from Feb-Dec, and my Australian tertiary studies begin in March, whereas all admissions decisions from the US come out in April.</p>

<p>So just a word for anyone in a similar position as I was - I emailed the MIT Admissions Office and they said it was okay for me to apply as a freshman.</p>