The Most World's Important Unanswered Historical Question: "What Changed In 1800?"

The economic historian Gregory Clark summarizes a remarkable fact.

. . . there is no sign of any improvement in material conditions for settled agrarian societies as we approach 1800. There was no gain between 1800 BC and AD 1800 -- a period of 3,600 years. Indeed the wages for east and south Asia and southern Europe for 1800 stand out by their low level compared to those for ancient Babylonia, ancient Greece, or Roman Egypt.

Then, around 1800, this all changed. Economic growth began: about 2% per annum, compounded. That brought our world into existence.
We are the great beneficiaries of a process that few people understand. No one has explained cogently how it came into existence. A rate of growth so slow that no one could perceive it at the time has created a world that would have been inconceivable in 1800.
This change has taken a mere three generations. This is simply inconceivable.
My daughter gave me a great Christmas present in 2010. She scheduled an appointment for me to interview a man in her church. His name is Lyon Tyler. My daughter grew up in a city named after his grandfather: Tyler, Texas. His grandfather was John Tyler, the tenth President of the United States. He signed the law that admitted Texas into the Union in 1845.
John Tyler was born in 1790, the first full year of Washington's Presidency.
Lyon Tyler's younger brother, also alive, uses the ultimate one-upsmanship one-liner I have ever heard. After chatting for a while with a stranger, he springs it on him.

"As my grandfather once said to Thomas Jefferson. . . ."

You can try to top that one. You won't succeed.

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