It's been two months since President Trump abruptly ordered the withdrawal of US troops from northern Syria, paving the way for a bloody Turkish offensive in that region. (See our earlier coverage here.) What's happened since? A guide for the puzzled:

No "end date" for US troops in Syria – US Secretary of Defense Mark Esper said this week that the United States has completed its military pullback in northeastern Syria. Back in October, President Trump pledged to withdraw the roughly 1,000 American troops deployed there. Since then, some American troops have left Syria altogether, while others were redeployed to defend nearby oil fields from ISIS, as well as from Syrian government troops and Russia. Now, there are roughly 600 American troops dispersed around Syria, and the remainder have been deployed in Iraq to stave off a potential ISIS resurgence. It's not clear if any troops have returned to the US. When asked about the chaotic comings and goings of US troops in Syria in recent months, the commander of US Central Command said frankly: there's no "end date" for American troops stationed there.

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The collapse of the Islamic State's self-declared caliphate in Iraq and Syria has given rise to a host of new challenges for governments around the world. Turkey has captured thousands of ISIS fighters as a result of its offensive in northern Syria, many of whom are foreign nationals who left their home countries to fight with the Islamic State. To date, non-Middle East countries have mostly opposed ISIS fighters returning home, leaving them, and their spouses and children, in legal limbo. Here's a look at where these foreign fighters come from.

It's the stuff of real high-powered, honorable diplomacy.

While schmoozing with his chums – including Prime Minister Boris Johnson of Britain and President Emmanuel Macron of France – at a Buckingham Palace reception at the NATO summit in London, Canadian Prime Minister Justin Trudeau was caught on video referencing President Trump's impromptu news conference earlier in the day: "You just watched his team's jaws drop to the floor," Trudeau said, oblivious that he's being recorded. President Trump, who has zero tolerance for public mockery, responded as you might expect from the president of the United States: he called Canada's premier "two-faced" and departed the summit early, abandoning a slated press conference.

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In recent years, international forums for accelerating action on climate change have turned into finger pointing exercises about which countries should do the heavy-lifting when it comes to tackling global warming. The US and China are usually deemed the worst culprits because they produce the most carbon dioxide in absolute terms, accounting for a combined 42 percent of global pollution. But population and economy size are two major determinants of a country's carbon footprint. When CO2 emissions are considered on a per-capita basis, for instance, China doesn't even make the top ten. Here's a comparative look at the countries that pollute the most.

For almost half a century NATO and the Soviet-backed Warsaw Pact alliance glowered at each other across the Iron Curtain. But after the Soviet empire collapsed, NATO expanded further eastwards, welcoming former East Bloc members into the organization. For these countries, it was a way to anchor themselves firmly in the "West," and to protect themselves from any future Russian revanchism. But Moscow saw NATO's eastward creep as a direct challenge to Russia's sphere of influence. Tensions between Washington and Moscow over NATO persist. Here's a look at the history of the organization's expansion.

126: Marking the Year of Return – the 400th anniversary of the beginning of the US slave trade– Ghana granted citizenship to 126 African Americans and Afro-Caribbeans last week as part of an effort to encourage slaves' descendants to return. Three quarters of the West African slave "dungeons" that held slaves before their forced journey to the Americas were based in what is now Ghana.

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The world's economy is set to grow at its slowest pace since the global financial crisis a decade ago, according to the OECD, a group of industrialized nations. The gloomy report says governments aren't doing enough to deal with big structural changes like US-China trade tensions, climate change, or the digital revolution. The last time the global economy nose-dived countries were able to muster enough collaboration to coordinate a global response. But given the profound dysfunction of the international order these days, it's hard to imagine countries doing the same again if things take a turn for the worse. Here's a look at global GDP growth over the past decade as measured by the OECD.

After a jam-packed week of testimony in the impeachment probe of President Trump there were plenty of memorable moments, but will any of it sway public opinion? The answer is: probably not. Overwhelmingly, US voters across parties say nothing they hear in the impeachment inquiry will change their minds, according to a recent NPR/PBS News Hour/ Marist poll. Independents are a little more open-minded than Republicans or Democrats, but not by much. Here's a look at the numbers.