Dhaka, July 8 -- When Roseline Phay set out in search of contraceptives earlier this year, she didn't realize she was already too late. Liberia's clinics had run dry after U.S. President Donald Trump abruptly suspended most foreign aid through USAID, which had been the backbone of the country's healthcare system.

Phay, a 32-year-old farmer and mother of two, trekked repeatedly from her rural village in Bong County to the nearest clinic. Each time, she returned empty-handed. Eventually, she became pregnant. With another child on her back and no access to nutritional support or contraceptives, she said, "I'm suffering."

She is among millions affected by the U.S. cuts across Africa. Liberia, where U.S. aid once made up 2.6% of its gross na...