For decades, the U.S. Agency for International Development, or USAID, worked across many of the world’s most food-insecure and climate-besieged regions, funding thousands of humanitarian, healthcare, food, and disaster relief programs. That all changed last year when, days after President Donald Trump’s inauguration, his administration issued a stop-work order that suspended nearly all of USAID’s overseas programs. Then, last July, the administration informally dissolved the agency — leading to the largest withdrawal of American international development aid in more than 60 years.  A new study published May 14 in the journal Science suggests the sudden USAID shutdown could have been linked to an uptick in violent conflict across much of Africa, with some of the most politically fragile regions seeing the largest spikes.…