The first question concerns today, March 4th, while the others follow on with a common theme.

Image Wikimedia Commons
One
On this day in 1837, Chicago was incorporated as a city. To the nearest thousand, what was the population?
Two
To the nearest million, what was the population of England at the beginning of Elizabeth I’s reign in 1558?
Three
In what decade did the world’s population first reach the 3 billion mark?
Four
Which country has the fourth highest population with a current figure exceeding 287 million?
Five
What two continents have the highest populations?
Good luck! I’ll post the answers later.
