First boats allowed for people to migrate and they lived along bodies of water. Then with horses they could travel a bit farther. Trains were a big advancement. People could travel long distances in a short amount of time. And next of course came cars and eventually planes which advanced and became more efficient.
People saying racist things to each other or wars that move a group of people because of their race for example like the nazi party hitler didn't like jewish people.
D. Miltiades defeated the athenian force
They were intended to stop terrorist groups
