Hundreds of thousands of residents took to the streets of Hong Kong Sunday in a largely peaceful protest against a bill that would allow residents to be tried in mainland China.

Organizers told The Wall Street Journal 1 million people showed up, or one in every seven residents. Police say 240,000 people showed up.

Critics of the extradition bill say residents would face China's less transparent legal system. Beijing had previously allowed Hong Kong to keep its own legal system after the British left the colonized region in 1997.

Here's the history behind why Hong Kong residents staged a mass protest on Sunday.

Hong Kong residents staged a massive protest on Sunday over a bill that would allow courts to extradite Hong Kong residents to mainland China for trial. Protest organizers say 1 million people walked the streets, while the police put the number at 240,000.

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Associated Press

Source: The Wall Street Journal

The extradition bill would allow officials to send suspected criminals to mainland China to be tried. Critics of the bill argue Hong Kong residents would be subjected to unfair trials and worse legal protections in the mainland.

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Source: South China Morning Post

Hong Kong is a semiautonomous territory in China. The British colonized the area for 150 years. Since handing back the territory to China in 1997, the two governments agreed to allow Hong Kong to retain its own legal systems until 2047.

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Source: Vox

Yet Beijing has tried to undermine Hong Kong's sovereignty, resulting in various protests over the last decade. Another major protest happened in 2014 during the 'Umbrella Revolution,' when residents rallied against mainland plans to pre-screen Hong Kong leaders.

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Human rights groups have expressed concern about China's use of torture, capital punishment, and arbitrary detention within the legal system.

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Source: Human Rights Watch , Al Jazeera

Critics of the extradition law also call out Hong Kong's chief executive, Carrie Lam, for a lack of leadership over the unpopular legislation. Lam introduced the bill in February after a Hong Kong resident murdered his girlfriend in Taipei before fleeing back to his home city, and since tweaked the bill after pressure from the opposition.

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Associated Press

Source: South China Morning Post

Some critics from Hong Kong worry China has already begun overstepping on the city's legal system. A Hong Kong billionaire mysteriously disappeared in January after being into custody in mainland China. A bookseller connected with publications that criticize the communist regime also went missing, before revealing he was taken into Chinese custody.

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Reuters

Source: The New York Times , The New York Times

I needed to let my voice be heard, protestor Kitty Wong told the Wall Street Journal. We need to defend our home for the next generation.

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Reuters

Source: The Wall Street Journal

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