Two groups of Celts from southern Europe invaded the British Isles. The Brythons (Britain) settled on the largest island, Britain. the second groups was called the Gaels; they settles on the second largest island, now called Ireland. The Celts were farmers and hunters.
Colonial era: british
WW1: American
WW2: British (America for the atom bomb... but thats just one weapon. and they massed produced everything else really)
after that: AMERICA!!
B - Slave revolts.
The revolt of Spartacus, which was also the most famous slave uprising in the history of the Roman Empire, lead to questions about the usefulness and effectiveness of the current governmental system in Rome. This, along with other factors, made them plunge into a crisis which ended through the transition to an empire.
