Rusting pipes in a barren field and unpaid workers are what remain after a U.S. company promised to turn a huge piece of land in Senegal — about twice the size of Paris — into an agricultural project and create thousands of jobs. In interviews with company officials and residents, The Associated Press explored one of the growing number of foreign investment projects targeting Africa, home to about 60% of the world’s remaining uncultivated arable land. The continent has seen a third of the world's large-scale land acquisitions between 2000 and 2020, mostly for agriculture, according to researchers from the International Institute of Social Studies in the Netherlands.