As the world parties, many will also look forward to 2019 and wonder whether the turmoil witnessed during the previous year will spill over into the next.

Fireworks explode over the Sydney Harbour during New Year's Eve celebrations in Sydney, Australia, on January 1, 2019.
Fireworks explode over the Sydney Harbour during New Year's Eve celebrations in Sydney, Australia, on January 1, 2019.
(Reuters)
Revelers around the globe are bidding farewell on Monday to a year filled with challenges to many of the world's most basic institutions, including politics, trade, alliances and religion. 
Fireworks, spiritual services and political addresses abounded to mark the transition.
Here is a look at how people are ushering in 2019:
Fireworks explode over Chao Phraya River during the New Year celebrations in Bangkok, Thailand, January 1, 2019.
Fireworks explode over Chao Phraya River during the New Year celebrations in Bangkok, Thailand, January 1, 2019.
(Reuters)
A make-up artist decorates the hair of a woman in the shape of Santa Claus during the New Year preparations in Ahmedabad, India, on December 31, 2018.
A make-up artist decorates the hair of a woman in the shape of Santa Claus during the New Year preparations in Ahmedabad, India, on December 31, 2018.
(Reuters)
Fireworks explode over Victoria Harbour during New Year celebrations in Hong Kong on January 1, 2019.
Fireworks explode over Victoria Harbour during New Year celebrations in Hong Kong on January 1, 2019.
(AFP)
A woman hangs paper notes bearing her New Year wishes outside the Jogyesa Buddhist temple in Seoul, South Korea, Monday, December 31, 2018.
A woman hangs paper notes bearing her New Year wishes outside the Jogyesa Buddhist temple in Seoul, South Korea, Monday, December 31, 2018.
(AP)
Fireworks burst over the water of Marina Bay during the New Year countdown celebrations in Singapore on January 1, 2019.
Fireworks burst over the water of Marina Bay during the New Year countdown celebrations in Singapore on January 1, 2019.
(AFP)
Worshippers pray as they take turns lying in coffins during a ceremony at the Takien temple in suburban Bangkok, Thailand on December. 31, 2018. Worshippers believe that the ceremony – symbolizing death and rebirth – helps them rid themselves of bad luck and are born again for a fresh start in the new year.
Worshippers pray as they take turns lying in coffins during a ceremony at the Takien temple in suburban Bangkok, Thailand on December. 31, 2018. Worshippers believe that the ceremony – symbolizing death and rebirth – helps them rid themselves of bad luck and are born again for a fresh start in the new year.
(AP)
Fireworks explode in front of Malaysia's landmark building, the Petronas Twin Towers, during the New Year's celebration in Kuala Lumpur, Malaysia, on January 1, 2019.
Fireworks explode in front of Malaysia's landmark building, the Petronas Twin Towers, during the New Year's celebration in Kuala Lumpur, Malaysia, on January 1, 2019.
(AP)
Source: trtworld.com