Al Jazeera writes: The US invasion of Afghanistan began in 2001. Twenty years on, the Americans are still there, but President Joe Biden has promised the mission will finally end on August 31, 2021. Once US troops are gone, Afghanistan’s affairs will have to be solved internally. Can the country overcome the wounds left by years of disagreement and sectarian division? After months of intra-Afghan talks, have the different sides built trust? Abdullah Abdullah, the chief of the High Council for National Reconciliation, talks to Al Jazeera.