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Why is immigration such a big issue in an election?

6 May 2015 Last updated at 06:42 BST

The countdown to the general election is on. Tomorrow, adults across the country decide who they want to run the country.

One of the big issues being talked about by politicians and the public is immigration.

Immigration is when people come into a country where they weren't born to live and work.

It's been happening for many years in the UK - but why do voters care about it so much?

Watch Ayshah's report to find out more.