Answer:The British Army had suffered 420,000 casualties including nearly 60,000 on the first day. The French lost 200,000 men and the Germans nearly 500,000.
Explanation:
Migration led to the population of the world because human life started in Africa, meaning that for people to inhabit places that are now known as America, Europe, Australia, etc., they had to all migrate out of Africa.
The great age of conquest had ended a few decades before. Three legions had been destroyed in the Battle of the Teutoburg Forest by rebellious German tribesmen in 9 AD, and the emperor Augustus concluded that the empire was overextended and called a halt to new wars of conquest.
Explanation: this will help you.