1819: America is a small, new country with only twenty-two states. The nation battled Great Britain for its freedom in the American Revolution from 1776 to 1783, and fought them again for maritime rights in the War of 1812, which lasted until 1815.

Today: America is an economic superpower, and Great Britain is one of its closest allies.

1819: The entire population of England is around 21 million, leaving much open, unpopulated land.

Today: The population of England is around 46 million. With about 917 people per square mile, it is one of the most densely populated countries in the world.

1819: England has the world's greatest navy, making it one of the most powerful countries in the world.

Today: The Royal Navy is thirteenth largest fleet in the world and second largest in Europe (after Greece).

1819: Ordinary people rely on poetry to convey physical experiences.

Today: Technological advances in photography, sound recording, and...