A little bit about Colin Kaepernick...

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Kaepernick, born in Milwaukee in 1987, is a former quarterback-turned-activist who is known for his political activism regarding systematic racism against African-Americans.

Kneeling for what he believes in...

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In 2016, during the 49ers third preseason game, Kaepernick began kneeling during the US national anthem prior to games, rather than standing as is customary.

He knelt during the national anthem in protest of police shootings of African-American men and other social injustices faced by black people in the US.

Speaking in an interview in 2016, Kaepernick said: "To me, this is something that has to change, and when there's significant change and I feel like that flag represents what it's supposed to represent and this country is representing people the way that it's supposed to, I'll stand."

His kneeling was a sign of respect.

Kaepernick later said that he "couldn't show pride in a flag for a country that oppresses black people and people of color." He opted for kneeling over sitting, however, as a sign of respect for the men and women who fight for the United States.

Kaepernick's actions inspired others...

His teammate, Eric Reid, soon began to kneel beside him, alongside other teammates such as Antoine Bethea, Eli Harold, Jaquiski Tartt, and Rashard Robinson.

The NFL's response wasn't positive...

Initially, the NFL released a statement claiming that players were only encouraged, and not required, to stand during the national anthem. But, in 2017, Kaepernick became a free agent. No team would offer him a contract, and, in October of that year, he filed a grievance against the league, accusing team owners of colluding to keep him signed.

Yet players still continued to kneel.

After Kaepernick's attorney stated that "athletes who protest peacefully should not be punished", public backlash mounted until team owners declared that all team personnel on the field must "stand and show respect for the flag and the anthem."

This announcement caused even more outrage...

If any team members where caught kneeling during the anthem, the team would be fined and the decision would be upon the team leader whether or not they punish that particular player. This did not sit well with the players, nor did it with the rest of America.

Kaepernick was used as the face for Nike's "Just Do It" campaign...

For the thirtieth anniversary of Nike's "Just Do It" campaign in September 2018, Colin Kaepernick was used as the frontman of the global phenomenon, along with the headline: "Believe in something. Even if it means sacrificing everything."

Kaepernick is now endorsed by Nike.

The "sacrifice" is clearly in reference to his kneeling protests that resulted in him not being able to participate in the sport anymore. The fact that Nike used his image and beliefs to promote their brand is a huge step forward for the rights of black Americans and the racial injustices that still go on to this very day.

And he has had had a flurry of support from thousands of people all over the world.

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After Donald Trump said that athletes who kneeled during the national anthem were disrespecting the U.S. and its patriotic symbols, the hashtags #TakeAKnee and #TaketheKnee began trending.

And a number of celebrities have voiced their support.

Stevie Wonder was another iconic figure to show his alliance with Kaepernick.

The music legend performed at the Global Citizens Festival in New York in September 2017. And he had the following to say in support of Kaepernick and the other NFL players...

Even the whole cast of Star Trek: Discovery rallied together to show their support.

And actress, Sonequa Martin-Green, shared a photo on her Instagram of the team all kneeling on their knees with the hashtag, #takeaknee.

And the latest celebrity to express her support...

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Is none other than the pop legend, Rihanna.

Rihanna has famously turned down the Super Bowl performance...

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The Super Bowl half-time show is one of the biggest entertainment events in the world, and each year features iconic musicians.

RiRi was asked to perform at the huge event...

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But she turned down the invite, saying that she "couldn't dare do that" to Colin Kaepernick.

She believes that the NFL player was being blackballed.

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In her cover story with Vogue, the singer confirmed she was taking a stand against the league. "I couldn’t dare do that. For what? Who gains from that? Not my people," Rihanna said, "...I just couldn’t be a sellout. I couldn’t be an enabler."

Rihanna has been vocal about her disapproval of the organization.

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"There are things within that organization that I do not agree with at all," the singer explained, "...and I was not about to go and be of service to them in any way."

The NFL have instead landed Maroon 5 and Travis Scott for the half-time performance.

And, as for Colin, he has clearly noticed Rihanna's support and has been retweeting stories of the singer's interview on his Twitter page.