Amazon has become the second publicly traded company in the US to be valued at a $1 trillion, just weeks after tech giant Apple became the first to reach the historic milestone.
In the 24 years since its founding, the company has capitalised on a growing demand for online shopping. It now generates $178bn in revenue each year.
The company has gone from being an online marketplace to a movie and television producer, e-book publisher, and cloud storage centre. It also created a popular, digital home assistant named "Alexa".
Amazon's success has also made its CEO, Jeff Bezos, the richest person in the world – something Senator Bernie Sanders took shots at during a Labour Day event.
“We have one person whose wealth is increasing by $250 million every single day, while he pays thousands of his workers wages that are so low that they are forced to go on food stamps, Medicaid, and subsidized housing.”
The company hit back with a statement claiming Mr Sanders had spread "misleading statements".
"We encourage anyone to compare our pay and benefits to other retailers," the company said.
It was not the first time the nearly 600,000-person company has been criticised for its employment practices. A 2015 expose from the New York Times revealed how even the company's white-collar employees are often worked past their breaking points. The company responded by calling the article "sensational" and saying it had misrepresented the company.
Amazon has also found a frequent critic in President Donald Trump, who recently accused the company of failing to pay its fair share of taxes to using Mr Bezos 's ownership of the Washington Post to lobby for its interests.