LUANDA, Angola — President Joe Biden made history Monday as he becomes the first American head of state to visit the southern African nation of Angola, where he will showcase U.S.-backed infrastructure projects designed to link three nations. 

In his first visit to sub-Saharan Africa, which comes at the end of his White House tenure, Biden is set to hold a bilateral meeting with his Angolan counterpart, João Lourenço, in the capital, Luanda. He will also give a speech at the country’s…