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LONDON- Britain prepares for a vote Thursday that will decide whether it leaves the European Union. The debate has centered on immigration and economic security. Both sides have lowered the tone of their arguments after a three-day suspension(暂停) of campaigning that followed the murder of an anti-Brexit lawmaker, an incident that polls(民意调查) suggest has shocked many previously undecided voters who now say they will vote to remain.

These are uncertain times in a nation whose economy is the second largest in the European Union. The risks are huge. There are warnings that leaving the 28-member group may cause the British pound to lose 15 percent of its value and bring the resignation(辞职) of David Cameron, the country's prime minister; his stay or not depends on whether Britain listens to him and votes to remain.

For months, the Leave campaign has been hitting the streets. Its arguments are based largely on immigration, and the belief that Britain has handed control of its borders(边界) to a European super state: "The U.K. has lost control over migration. We have to accept anyone into this country if they have an EU passport, no matter if they have a criminal record or not. We are not allowed to say 'no' to people and that is damaging for the security of the U.K., but it is also putting pressure on jobs and opportunities for young people," said Tom Harwood, a Brexit campaigner.

The murder of Jo Cox, an anti-Brexit, pro-immigrant lawmaker by a far right extremist(极端分子) with a history of mental problems had a serious effect on both campaigns, and on voters.

Polls since the June 16th murder showed the Leave camp losing ground, but with both sides still very close on a referendum(全民投票) that many believe could change the course of European history.