About halfway into the 18-year war, Afghans stopped hiding how corrupt their country had become.

Dark money sloshed all around. Afghanistan’s largest bank liquefied into a cesspool of fraud. Travelers lugged suitcases loaded with $1 million, or more, on flights leaving Kabul.

Mansions known as “poppy palaces” rose from the rubble to house opium kingpins.

President Hamid Karzai won reelection after cronies stuffed thousands of ballot boxes. He later admitted the CIA had delivered bags of cash to his office for years, calling it “nothing unusual.”

In public, as President Barack Obama escalated the war and Congress approved billions of additional dollars in support, the commander in chief and lawmakers promised to crack down on corruption and hold crooked Afghans accountable.

In reality, U.S. officials backed off, looked away and let the thievery become more entrenched than ever, according to a trove of confidential government interviews obtained by The Washington Post.