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 ... the decisions that created today's growth - decisions about education, infrastructure and the like - were made decades ago. The following rankings come from various lists, but they all tell the same story. 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. Reducing funds for things like education, scientific research, air-traffic control, NASA, infrastructure and alternative energy will not produce much in savings, and it will hurt the economy's long-term growth. It would happen at the very moment that countries from Germany to South Korea to China are making large investments in education, science, technology and infrastructure.