Earlier quoted context omitted.
Why do you feel that our educational system achieved "great heights", and why do you believe these heights made the US a "20th century powerhouse"?
The United States is about 5% of the World's population, and produces about 25% of the World's economic output. This has been true for about the last 60 years. The USA and Western Europe have had the most expensive labor, focusing on high-quality products and services that require more education, but justify the higher labor cost.
Think "good enough."