I am an American, not by accident of birth but by choice. I voted with my feet and became an American because I love this country and think it is exceptional. But when I look at the world today and the strong winds of technological change and global competition, it makes me nervous. Perhaps most unsettling is the fact that while these forces gather strength, Americans seem unable to grasp the magnitude of the challenges that face us. Despite the hyped talk of China's rise, most Americans operate on the assumption that the U.S. is still No. 1. But is it? Yes, the U.S. remains the world's largest economy, and we have the largest military by far, the most dynamic technology companies and a highly entrepreneurial climate. But these are snapshots of where we are right now. The decisions that created today's growth — decisions about education, infrastructure and the like — were made decades ago. What we see today is an American economy that has boomed because of policies and developments of the 1950s and '60s: the interstate-highway system, massive funding for science and technology, a public-education system that was the envy of the world and generous immigration policies. Look at some underlying measures today, and you will wonder about the future.

The following rankings come from various lists, but they all tell the same story. According to the Organisation for Economic Co-operation and Development (OECD), our 15-year-olds rank 17th in the world in science and 25th in math. We rank 12th among developed countries in college graduation (down from No. 1 for decades). We come in 79th in elementary-school enrollment. Our infrastructure is ranked 23rd in the world, well behind that of every other major advanced economy. American health numbers are stunning for a rich country: based on studies by the OECD and the World Health Organization, we're 27th in life expectancy, 18th in diabetes and first in obesity. Only a few decades ago, the U.S. stood tall in such rankings. No more. There are some areas in which we are still clearly No. 1, but they're not ones we usually brag about. We have the most guns. We have the most crime among rich countries. And, of course, we have by far the largest amount of debt in the world.

via TIME.