1. There are 28 member States in the EU region, and the EU is equivalent to one country, while 28 member States are equivalent to 28 provinces. Every citizen of these 28 member States can work freely in every EU country and enjoy the same benefits as the locals.
Britain is a very rich country among EU member states. As many EU member countries lag behind Britain in economic level, a large number of poor people from Eastern European countries come to work in Britain, and a large number of Syrian refugees come to work in Britain, which has indeed seized the employment of British natives.
For example, a construction worker in Britain is a hard job. Because this kind of work involves a lot of dirty work, many British people are unwilling to do it. Therefore, British companies have adjusted the wages of construction workers to a very high level, attracting a large number of British locals to be construction workers. The British earn their own money, and the British government has no complaints.
However, because a large number of poor people from Eastern Europe and Syria come to work in Britain, they need far less remuneration than local workers in Britain. British entrepreneurs are willing to hire these poor people from eastern Europe and Syria, which can reduce wages and save costs for British enterprises. But the British natives are unemployed.
Migrant workers from EU countries can enjoy British welfare policies when they come to Britain. For example, local patients in Britain need to register in the national medical system and queue up for surgery, but a large number of people from EU countries also come to Britain to enjoy British medical care, which increases the waiting time for other British people to see a doctor.
6. Britain's annual imports from EU countries are greater than Britain's exports to EU countries, so Britain feels very disadvantaged, so Britain must leave the EU. Britain does not want people from other EU countries to come to Britain to enjoy British welfare.