The US has established its first diplomatic presence in Somalia for nearly 30 years.
The state department said the “historic event” reflects the progress the east African nation has made.
Ambassador Donald Yamamoto is heading the embassy in Mogadishu.Previously it had been based in Nairobi, Kenya.
The US closed its embassy in Somalia in January 1991 amid fighting between rebels and the government and had to airlift out its ambassador and staff.