Greta Thunberg, Megan Rapinoe, and Rudy Giuliani made Time magazine's Person of the Year shortlist for 2019

President Trump's administration faced highs and lows in 2019, from the killing of ISIS leader Abu Bakr al-Baghdadi, to the start of impeachment hearings scrutinizing his dealings with the Ukraine.

The social network that Zuckerberg founded and continues to run has faced harsh criticism in the past year for its handling of user data and privacy.

Xi Jinping made the list in the middle of a tense US-China trade war, and as China is trying to stifle anti-government protests in Hong Kong and criticism over his government's coordinated mass crackdown on the Uighur Muslim minority.

The anonymous CIA officer wrote a report alleging Trump withheld aid to Ukraine to get the country to investigate the son of his political rival, former Vice President Joe Biden. That allegation sparked the House's impeachment inquiry.

Rapinoe helped lead the US women's national soccer team to win their second World Cup in a row.

She also garnered attention for saying she would not visit the White House if they won the championship, joined her teammates in demanding equal pay to the US men's national team players, and has been a champion for LGBTQ rights.

Giuliani, the former mayor of New York City, has been working as Trump's personal lawyer.

The impeachment hearings have revealed what a key player he was in Trump's alleged quid pro quo with Ukraine.

Ardern was praised for the way she responded to her country's darkest hour — March's attacks in Christchurch.

Dozens were killed when terrorists targeted mosques and Islamic centers in Christchurch, New Zealand.

Many found it refreshing when she showed emotion and cried in public, as well as her choice to wear a hijab to visit with members of the impacted Muslim community.

Swedish teen Greta Thunberg, 16, brought new attention to climate change with her school strikes that grew to more than a million students across the world.

This year, she sailed across the Atlantic to deliver remarks at the United Nations climate change conference — where she chastised world leaders for not doing enough to curb emissions and tackle the issue.

Protests erupted in Hong Kong this summer, when a new bill was introduced that would have allowed prisoners to be extradited to mainland China.

Residents took to the streets to express their outrage at what they perceived to be a concerted effort for China to exert more control over the island.