The people in ancient times travel from place to place in search of food and shelter before the cultivation of agriculture and settled life man was depended on wild animals and fruits for food so they used to travelle from one place to onother , besides in safe from harsh climate he used to travelle from one place to onother place
The strategy of containment is known as the cold war foreign policy of the united states and its allies to prevent the spread of communism after world war 2 ended.
