Mr. Kirby, first of all your gossip at the US state department does not matter with recognition of Durand Line! And it never mattered, because since the creation of Pakistan, US governments have been on the same page, supporting the unjust Pakistan.
What actually matters is the strong will and courageous ambitions of the people and young leadership on both sides in Afghanistan and Pashtunkhwa to put an end to the bloody line and get united. No power in the world can stop them.
Unnecessarily interfering in other people's affairs in an arrogant manner like yours is the main factor contributing to the shattering of American dreams, destroying your nation's goodwill and the democratic values of your country.
If you believed in democracy you would have called on Pakistan to give basic human right of millions living under a century old inhuman law of Frontier Crime rule, one third of Pakistani resident have no basic human rights of – appeal, wakeel and daleel (the right to request a change to a conviction in any court, the right to legal representation and the right to present reasoned evidence, respectively).