A generation of American military presence in Afghanistan is nearing its end. But what comes next? Here's Nick Schifrin.The sprawling hub of American operations in Afghanistan for nearly two decades, Bagram Airfield, is now in the hands of the Afghan government.U.S. defense officials say all American forces outside of the Kabul Airport and embassy have left the country.President Biden today suggested the country's challenges are now the Afghans' problem.We have worked out an over-the-horizon capacity that we can be value added, but the Afghans are going to have to be able to do it themselves with the air force they have, which we're helping them maintain.Sir, on Afghanistan...I'm not going to answer any more quick question on Afghanistan. Look, it's Fourth of July.On the economy...Are you concerned about Fourth of July gatherings...I'm concerned that you guys are asking me questions that I will answer next week. But I'm -- this is a holiday weekend. I'm going to celebrate it.So, what of this moment in Afghanistan and its very uncertain future? Our Jane Ferguson joins me from Kabul. Jane, good to see you. Talk about the mood on the ground in Kabul. How does the government feel? How does the city feel?Government officials, Nick, are trying to make sense of what the next coming weeks and months are going to mean for them.They have spent the last months trying to make sure that they could secure the U.S. funding, that $4 billion a year for the Afghan security forces.But now they have much bigger concerns, whether or not they can hold any more ground against the Taliban.And to a certain extent, some of the political leadership here has really gone to ground.