Voters are going to the polls across the UK to pick 650 MPs - and that will the decide our next Prime Minister.
The polls have Boris Johnson's Conservatives tipped to win either an overall House of Commons majority or the most seats in a hung parliament.
Of course, anything is possible, and if Jeremy Corbyn's Labour Party does win an overall majority it would have a radically different impact on Britain's future.
So how will these radically different forks in the road impact the state of the UK?
Our head of politics Jason Beattie has outlined the different options facing the UK.
Boris Johnson wins an overall majority
Brexit: The Prime Minister plans to railroad his withdrawal agreement through Parliament before Christmas to make sure we leave the EU by January 31.
Far from getting Brexit done this triggers the start of months, if not years, of trade talks with the EU and other countries, including the US, India and Australia.
Johnson has pledged to get a trade deal with the EU by December 2020. If he fails we could face a no-deal Brexit on that date.
What happens next will depend on the size of the Tory majority. If Johnson wins comfortably he should be able to play for time but if it is a narrow margin then he will be in hock to the hard Brexiteers in his party.
Public services: The Tories have promised more nurses, extra money for schools and hospitals and 21,000 more police officers.
But their spending plans only envisage more money for the NHS, with education, councils and the Home Office spending still below pre-2010 levels.
And they depend on what happens with Brexit. If there is no trade deal the economy could slide and the Tories will not have money to invest in public services.
This could lead to a stinging backlash from voters.
The UK: The Conservatives’ Brexit plans could lead to the break up of the United Kingdom.
Leaked Treasury documents showed that Northern Ireland will be “symbolically” cut off from the rest of the UK because it will remain under EU for trade and there will be checks on imports between the mainland and Ulster.
Nicola Sturgeon will seize on the Tory majority and Johnson’s hard Brexit to press the case for another Scottish referendum.
The leaders: Jeremy Corbyn will face calls to quit immediately if he loses a second general election .
Allies of the Labour leader will try to persuade him to stay on with a view to installing a successor who will keep the Corbynite flame alive.
A bitter leadership race could pitch the left of the party against moderates who argue Labour will only win power with a new leader who takes the party back towards the centre ground.
Johnson will be safe for the foreseeable future as long as his Brexit plans do not become unstuck.
Jo Swinson’s position depends on how well the Lib Dems perform.
There is a hung Parliament
Brexit: Everything will depend on the numbers. Corbyn could become Prime Minister if the SNP , Lib Dems and Plaid Cymru agree to work with him.
Lib Dem leader Jo Swinson says she will only back Labour if Corbyn steps aside.
If Corbyn can form a government then he has promised to negotiate a new withdrawal agreement with the EU and put it to a referendum.
But if he is unable to form a government there could another election or Johnson has burnt his bridges with the DUP but if the numbers are tight he could try to strike a deal with the Lib Dems and the SNP - but they would demand a second referendum as the minimal price.
Public services: Labour will want to press ahead with its plans to raise taxes on business and the richest 5%.
Rail, water and the Royal Mail could be brought back into public ownership. There would be a big investment in social care, the NHS and education.
The SNP is likely to support much of this but the Lib Dems are opposed to many of Labour’s policies. Could scrapping Trident be the price Labour pays for the SNP support?
The UK: If Corbyn can form a Government with SNP support then a second Scottish referendum is highly likely.
Labour has indicated this would be an issue for later in the parliamentary term.
A new Brexit deal is unlikely to isolate Northern Ireland as Corbyn is looking for an agreement that keeps the whole of the UK in a customs union.
The leaders: What happens to the leaders will depend on the result and who can form a government. If the numbers fall in Labour’s favour and Corbyn becomes PM then Boris Johnson may try to cling on as leader.
But he will be under pressure to quit having thrown away the Tory lead in the polls and the chance for a fourth term in government.
Jo Swinson could find herself in the role of kingmaker even if her party failed to make headway at the election.
Jeremy Corbyn wins a overall majority
Brexit: Labour will press ahead with its Brexit plan of seeking to negotiate a new withdrawal agreement that protects jobs and business. This will then be put to the country in a second referendum. The Conservatives will come under fresh pressure from Nigel Farage’s Brexit Party having thrown away the chance to deliver Brexit.
Public services: Labour is promising to raise spending on all public servicces by increasing taxes on companies and the very rich. It’s bold policy agenda also includes renationalising rail, water and the Royal Mail and taking broadband under state control.
The Universal Credit will be scrapped and Waspi women compensated. Labour is also promising to pump billions into invest in a green jobs revolution.
The UK: If Jeremy Corbyn delivers a new Brexit deal that keeps the whole of the UK in a customs union this would ease tensions in Scotland and Northern Ireland. Much would depend on the outcome of the second referendum. If the country votes to stay in the EU then the appetite for independence in Scotland could ebb away.
The leaders: Boris Johnson will be under massive pressure to quit as leader having gambled everything on the election.
He will go down in history as the second shortest serving Prime Minister.
Jo Swinson could cling on as Lib Dem leader but much will depend on how her party has performed in the general election.
Corbyn will have proved his detractors wrong but at 70 will he want to serve a full term?
William Gladstone was 82 he won his fourth term as PM.
