Everyone has the right to freedom of movement and residence within the borders of each state.
Everyone has the right to leave any country, including his own, and to return to his country.
PLAIN LANGUAGE VERSION:
You have the right to come and go as you wish within your country. You have the right to leave your country to go to another one; and you should be able to return to your country if you want.
People leave their homes for a number of reasons: sometimes people can not find work in their area, sometimes their homes are destroyed by an earthquake or a war.
Sovereign states decide what limits to impose on immigration. And at times, freedom of movement is restricted during a public emergency where the safety of others need to be protected. In these cases, the restriction must be temporary and should not be imposed for political reasons.
public emergency is treated by the Covenant on Civil and Political Rights as a situation which threatens the life of the nation and the existence of which is officially proclaimed. For example, a natural disaster, an epidemic or war could necessitate restrictions.
United Nations High Commissioner for Refugees
It may be that you yourself, or someone in your family, has moved from another town or country. Chances are you'll know somebody who has moved. Think about why they moved, what it must have been like to enter a new community and what they are doing now. Then talk to them about these matters and record their stories, either on paper or on audio tapes. Prepare a report on the oral history you have gathered, showing things from their perspective. How is what they told you different from what you thought at first? How do you think they can contribute to their new environment?