Because American students are ignorant. And are allowed to be:
The [Florida] Board of Education decided in an emergency meeting Tuesday to lower the passing grade on the writing portion of Florida's standardized test after preliminary results showed a drastic drop in student passing scores.
Turns out, two-thirds of Florida students were going to flunk the test. So the threshold for "flunking" was altered.
Hence, everyone is smarter!
For the love of God.