Soon a bullish game-show host who made billions from his property empire will be in the White House.
It's not exactly the crisp, measured Harvard Law School graduate who became America's first black President eight years ago.
And this personality clash is only the first thing the US has to deal with.
Quickly we'll see President-elect Trump trying to dismantle some of Barack Obama's proudest achievements.
And where Obama failed, Trump wants to drive nails into the coffins of those struggles once and for all.
We have taken a look back on the outgoing President's mixed legacy and picked out the changes most likely to be ditched.
Hold on to your hats. It's going to be a wild four years.
1. Obamacare
Senators passed Obama's flagship Affordable Care Act in a controversial, knife-edge vote in 2010.
Forever nicknamed 'Obamacare', the law made health insurance compulsory for most people and stopped firms only covering the healthy.
Crucially, it expanded the Medicaid scheme of taxpayer-funded health cover for the poor - a safety net that nods to Britain's beloved NHS.
A whopping 22million more people are insured thanks to the law, the Congressional Budget Office estimated in March 2016.
But it also predicted government spending on Medicaid and the Children's Health Insurance Programme will hit $3.8trillion over 10 years - $1tn higher thanks to Obamacare.
Furious Republicans said they were vindicated when insurance firms, including Aetna, UnitedHealth Group and Humana, pulled out of the market in key states because they were losing money.
With some premiums shooting up, analysis and critics were divided over whether costs were lower after the ACA. This study said on average, they'd dropped.
Now Trump plans to ask Congress to "immediately deliver a full repeal" of the law on "Day One" and replace it with "free market principles".
And fortunately for him, the Republicans now control both houses of the US legislature, the Senate and the House of Representatives
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2. Gun control
The President has failed to cure America's gun epidemic despite the US being split by some of the bloodiest mass shootings in its history.During his term 50 were slaughtered in Orlando's Pulse gay club, 27 at Sandy Hook school, 14 in San Bernardino and 13 at the Fort Hood military base.
The US has the highest gun death rate of any developed country by a landslide - 3.6 people per 100,000, with Canada on Portugal on just 0.5, according to the American Journal of Medicine.
Obama waged a campaign to reform gun laws and passed executive orders.
Yet the right to bear arms is sacred to many thanks to the Second Amendment to the US Constitution and is fiercely protected by pressure groups.
Despite 100,000 being killed by gun violence in a decade, his pleas for major reforms including background check laws were repeatedly blocked by Senators.
"Gun violence requires more than moments of silence," Obama said. "It requires action. In failing that test, the Senate failed the American people."
But Donald Trump says the right to bear arms will be kept - "period". He wants to strengthen pro-gun laws and appoint Supreme Court judges who agree.
On the Orlando shooting, he told CNN: "If you had some guns in that club the night that this took place, if you had guns on the other side, you wouldn’t have had the tragedy that you had."
And he claimed reform could see Hillary Clinton assassinated, saying: "I think that her bodyguards should drop all weapons."
3. Winding down Guantanamo
Shutting down Guantanamo Bay was one of Barack Obama's first pledges in 2009.Campaigners and charities say the camp, on a US naval base in Cuba, has breached the human rights of terror suspects held for years with no charge.
But legal wrangles have kept it from closing 14 years after it opened under President George W Bush at the height of the 'War on Terror'.
More than 150 detainees were moved out of the camp under Obama, but it still has 59 inmates of which 20 are recommended for release, according to the Close Guantanamo campaign.
Obama renewed his pledge to close Guantanamo less than a year ago, saying it "does not advance our national security, it undermines it. This is not just my opinion - this is the opinion of experts, this is the opinion of many in our military."
Amnesty International has urged Obama to "use all the powers of his office" to shut the camp in his final days.
That's because Trump wants to keep so-called "Gitmo" open, saying: "We're gonna load it up with some bad dudes."
This week Trump tweeted: "There should be no further releases from Gitmo. These are extremely dangerous people and should not be allowed back onto the battlefield."
4. Winding down nuclear weapons
In 2010 Obama signed the New START treaty with Moscow, cutting the number of US warheads from 2,000 to 1,550 (and Russia's by a similar figure.)Obviously, this is still more than enough to kill the vast majority of humans on earth.
But it showed intent, and last year Obama called for a world without nukes on a visit to Hiroshima, 71 years after its annihilation at US hands.
He said he hoped the world would "find the courage, together, to spread peace, and pursue a world without nuclear weapons."
Trump, meanwhile, has reportedly shrugged: "Let it be an arms race".
He tweeted: "The United States must greatly strengthen and expand its nuclear capability until such time as the world comes to its senses regarding nukes."
This crosses over with another Obama policy Trump could scupper - his landmark deal with Iran over its nuclear programme in 2015.
Israeli prime minister Benjamin Netanyahu has vowed to raise the "bad" agreement with Donald Trump, who has criticised Iran strongly in the past. Will this run into trouble too?
5. Vast bailouts?
The economy had just nosedived when Obama was elected in 2008. Months later, Congress approved a $787billion bailout plan.Taxpayers lost billions of dollars from one of the more controversial moves, an $80bn bailout of car giants including General Motors and Chrysler.
Trump has given mixed statements on the deal and left American media puzzled.
In August 2015 he said of the car industry: "You could have let it go, and rebuilt itself, through the free enterprise system.
"You could have let it go bankrupt, frankly, and rebuilt itself, and a lot of people felt it should happen. Or you could have done it the way it went.
"I could have done it either way. Either way would have been acceptable. I think you would have wound up in the same place."
6. Globalisation
There's one thing we can be sure Trump opposes - globalisation.He fought the election vowing to abandon the Trans-Pacific Partnership, a trade deal with 12 nations Obama has failed to complete, on Day One.
In November Obama essentially pleaded with Trump to forge ahead saying there "will be no return to a pre-globalization world."
But for Trump, whose "Make America Great Again" approach to free trade set the tone for his whole campaign, any compromise would be political self-harm.
He has already railed against China for "devaluing their currency" and "heavily taxing our products".
And he has publicly shamed General Motors on Twitter for selling Mexican-made cars in the US.
Even as President-elect, words have consequences. An hour later GM's main rival Ford announced it was cancelling plans to build a new plant in Mexico and creating 700 new jobs in michigan
7. Action on climate change
Barack Obama appears passionate about climate change, hailing the Paris Agreement joined by 55 countries in 2015."One of the reasons I ran for this office was to make America a leader for this mission," he said.
Donald Trump appears passionate too... but not exactly in the same way.
"The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive," he tweeted in 2012.
In 2014 he added: "This very expensive global warming bulls*** has got to stop."
Since the election Trump has conceded there is "some connectivity" between humans and climate change.
But that didn't stop him vowing to repeal major domestic laws passed under Obama in a bid to "eliminate" any "wasteful regulation which kills jobs".Specific laws he's vowed to scrap include the Clean Power Plan, a 2015 bid to cut power plant pollution, and the Waters of the US rule protecting wetlands and waterways from industry.
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