Youthful businessman Nayib Bukele has assumed the presidency of El Salvador, ending more than a quarter century of two-party dominance in the crime-plagued Central America nation.

Dressed in a blue suit with no tie and accompanied by his wife Gabriela, the 37-year-old former mayor of San Salvador put his left hand on the Bible and swore to fulfill and enforce the laws of the country during his five-year term.

Thousands of Salvadorans in the Gerardo Barrios Plaza in the capital shouted: "Yes, it's possible! Yes, it's possible! Nayib president!"

El Salvador's incoming President Nayib Bukele, right center, and his wife Gabriela, arrive for his swearing-in ceremony in Plaza Barrios in San Salvador, El Salvador, Saturday, June 1, 2019. (AP PhotoSalvador Melendez)

El Salvador's incoming President Nayib Bukele, right center, and his wife Gabriela, arrive for his swearing-in ceremony in Plaza Barrios in San Salvador, El Salvador, Saturday, June 1, 2019. (AP PhotoSalvador Melendez)

El Salvador "has suffered greatly. It is a country that has had to rebuild; it has had earthquakes and corrupt governments and yet we continue move forward," Bukele said in his inaugural speech.

El Salvador's newly sworn-in President Nayib Bukele delivers his inaugural address in Plaza Barrios in San Salvador, El Salvador, Saturday, June 1, 2019. Pictured above Bukele are Supreme Court Chief Justice Oscar Armando Pineda, from left, outgoing President Salvador Sánchez Cerén, outgoing Vice President Oscar Ortiz, and lawmaker Guillermo Gallegos.(AP PhotoSalvador Melendez)

El Salvador's newly sworn-in President Nayib Bukele delivers his inaugural address in Plaza Barrios in San Salvador, El Salvador, Saturday, June 1, 2019. Pictured above Bukele are Supreme Court Chief Justice Oscar Armando Pineda, from left, outgoing President Salvador Sánchez Cerén, outgoing Vice President Oscar Ortiz, and lawmaker Guillermo Gallegos.(AP PhotoSalvador Melendez)

A woman holds up a poster that shows and image of El Salvador's newly sworn-in President Nayib Bukele during an inaugural ceremony in Plaza Barrios in San Salvador, El Salvador, Saturday, June 1, 2019. (AP PhotoSalvador Melendez)

A woman holds up a poster that shows and image of El Salvador's newly sworn-in President Nayib Bukele during an inaugural ceremony in Plaza Barrios in San Salvador, El Salvador, Saturday, June 1, 2019. (AP PhotoSalvador Melendez)

Supporters of El Salvador's newly sworn-in President Nayib Bukele cheer during an inaugural ceremony in Plaza Barrios in San Salvador, El Salvador, Saturday, June 1, 2019. (AP PhotoSalvador Melendez)

Supporters of El Salvador's newly sworn-in President Nayib Bukele cheer during an inaugural ceremony in Plaza Barrios in San Salvador, El Salvador, Saturday, June 1, 2019. (AP PhotoSalvador Melendez)