Secretary of State Antony Blinken is visiting Niger and Ethiopia as part of the Biden administration’s growing competition with China and Russia for influence across Africa. Niger has become a critical U.S. ally in the Sahel region, and the U.S. opened a new drone base in the city of Agadez in 2019. The U.S. has about 800 military personnel in Niger, and Blinken’s trip marks the first visit…