A confidential trove of government documents obtained by The Washington Post reveals that senior U.S. officials failed to tell the truth about the war in Afghanistan throughout the 18-year campaign, making rosy pronouncements they knew to be false and hiding unmistakable evidence the war had become unwinnable. The documents ... include more than 2,000 pages of previously unpublished notes of interviews with people who played a direct role in the war. Since 2001, more than 775,000 U.S. troops have deployed to Afghanistan, many repeatedly. Of those, 2,300 died there and 20,589 were wounded. The interviews ... underscore how three presidents - George W. Bush, Barack Obama and Donald Trump - and their military commanders have been unable to deliver on their promises to prevail in Afghanistan. The interviews also highlight the U.S. government's botched attempts to curtail runaway corruption, build a competent Afghan army and police force, and put a dent in Afghanistan's thriving opium trade. With judges and police chiefs and bureaucrats extorting bribes, many Afghans soured on democracy. Meanwhile, as U.S. hopes for the Afghan security forces failed to materialize, Afghanistan became the world's leading source of a growing scourge: opium. The United States has spent about $9 billion to fight the problem ... but Afghan farmers are cultivating more opium poppies than ever. Last year, Afghanistan was responsible for 82 percent of global opium production.