Britain's exit, or Brexit, from one of the world's most powerful trading blocs

will happen if Brits vote to leave in a national referendum on June 23

Polls show the Brexit vote could go either way

So here's how we got to the situation

The camp that wants to leave the EU are the so-called Euroskeptics

They kept the UK from adopting the Euro

when it was launched in 1999

Nowadays, they're more worried about the surge of immigration

The UK gets about 500 people added to its population every day

Since EU citizens have the freedom to live in any country they choose

leaving the bloc is the only sure way to stem the flow of people

Arguing "stay in" is Prime Minister David Cameron

He negotiated new terms to the UK's EU membership

including some reassurances for London's financial industry

and the right to restrict welfare payments to migrants

He says a breakup would be an economic disaster

Europe accounts for nearly half of the UK exports

and he says a Brexit would create a decade of uncertainty

for financial markets, investments, and the wider economy

The debate is whiplashing markets

and send the pound tumbling

Now, here's the argument

Those pushing for a Brexit say the EU has morphed from a free trade zone

into a super state that's eating away Britain's national sovereignty

The vote will likely come down to two issues

The economic risks of an exit versus concern about a flow of immigrants

that can't be stopped

Whichever way the vote goes

Britain's long love-hate relationship with the EU

will rumble on