Several heads of state attended the ceremony for President Adama Barrow. He was sworn into office last month at Gambia's embassy in neighboring Senegal as former leader Yahya Jammeh refused to cede power.
International pressure, including the threat of a regional military intervention, led Jammeh to finally accept his December election loss and fly into exile in Equatorial Guinea. Hundreds of thousands of Gambians welcomed Barrow's return to Gambia days later.
He has committed to stay in the International Criminal Court and rejoin the Commonwealth. He also has vowed to free political prisoners.
The international community has quickly warmed to Barrow's approach, with the European Union recently announcing an USD 80 million package of support after breaking off assistance amid tensions with Jammeh.
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British Foreign Secretary Boris Johnson visited Barrow on Tuesday, saying: "We are here to help."
Gambians at Independence Stadium on Saturday cheered Independent Electoral Commission chairman Alieu Momarr Njai, who had to flee to Senegal during the political crisis after standing by the election results.
Sall said Gambia and Senegal, a regional power that surrounds the tiny country except for its coast, must strengthen economic and other relations. Many Senegalese live in Gambia.
"We are the same people, and we remain the same people," he said.
Others attending included the heads of state of Ghana, Liberia and Ivory Coast and the US assistant secretary of state for African affairs, Linda Thomas-Greenfield.
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