1) The US mortgage crisis resulted from an unsustainable housing boom and loose lending practices, evidenced by rapidly rising home prices, high delinquency rates, and falling real household wealth.
2) Various government programs like HAMP attempted to help struggling homeowners through modifications and refinancing, but many borrowers ultimately redefaulted, especially those with high debt-to-income ratios in areas hit hard by falling home prices.
3) To better identify at-risk borrowers, lenders should develop more granular default prediction models incorporating factors like loan-to-value ratios, credit data, and neighborhood housing indicators, and use segmentation strategies to determine optimal pre-delinquency treatment.