Saying MIT is International is an understatement

In my business law class this morning, the lecturer asked how many people in the class were born outside the US. I thought maybe 50% would raise their hand. It was more like 75-80%. Wow. And based on what I've seen around the MIT campus, that isn't an anomaly. Being a white male in the United States, I'm used to being in the majority, so it is kind of refreshing to be in the minority. However, I'm a little concerned at what this means for US students. Are they not as good on average? Does MIT want a disproportionate number of international students? If I had to venture a guess without doing any research, I'd probably say yes on both counts.