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Sometimes bad weathers and natural disasters destroy things that you like or value. I think it is a push factor because, when your house is ruined you might think that place is bad. So you can not stay there anymore. You must move to other places for safety.

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There are many diseases around you. You maybe know in Africa there is an illness called malaria that is spread by mosquitos sucking people's blood. People will migrate to other places to avoid this sickness.

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Some city has very low quality education. So kids and parents migrate to another country to get better education or the school isn't good.

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In some places, things have a higher cost then others. For example, an apple may cost $0.59 in a place but only $0.39 in another place. Too high costs may cause people to leave and migrate to another place.

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Some medical care has non- professional doctors and there have dirty rooms and low quality beds.

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Before in the world, and some places now on Earth, there are hierarchies. People are being separated into different groups and have a difference of "high" and "low". To escape the hierarchy, people may move to other places that are fairer and equal.

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Opportunity can be an opportunity, an opportunity of going to job, to school, to do something, etc.. Some places have lesser opportunities then others, and some have more. This will cause people to migrate to places that have better and more opportunities instead of staying in their place that has less and worse opportunities.

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I think that it's a push factor, because slavery is like you can't live in this country anymore, and you have to go another country to live.

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Sometimes there are wars in the city or country, they must leave their country or city and go to a place that is saver for them to live in. If they don't go, they might die, or hurt theirselfes.

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I think it's pull factor because you can get better life some where else, and you want to get better life too! You want to get better life because you can have better environment, or food... You can live well in that place.

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In today's world, the technology of all countries is getting better and better. For example: Shenzhen, 40 years ago. Shenzhen was still a fishing village and then Shenzhen became more and more rich. Then many refugees came to help to build Shenzhen.
Then more and more people migrated to Shenzhen to have more and more new technology. People can have easier lives and everything will be more simple.