(added: actually, wait a sec, Wolfram is very wrong, Portugal Italy and Spain all existed when Columbus first sailed)
Mechanical steam power, automobiles, airflight, television, computers and landing on the moon was all accomplished in that relatively tiny timeframe of US existence.
Italy did not exist then as a country. It was unified by Garibaldi in 1861. Portugal is older, Spain, depends how you count it, but it was Castile and Aragon until 1469, and Granada was reconquered in 1492...
Apart from newly formed countries like USA, it can be a bit hard to define exactly when a country was formed. China can arguably be claimed to be many thousand years old, even if their current constitution only dates back to 1949.
Some countries would laugh at that http://www.wolframalpha.com/input/?i=10+oldest+countries
(added: actually, wait a sec, Wolfram is very wrong, Portugal Italy and Spain all existed when Columbus first sailed)
Mechanical steam power, automobiles, airflight, television, computers and landing on the moon was all accomplished in that relatively tiny timeframe of US existence.