The United States of America was one of the biggest champions of the Universal Declaration of Human Rights, which several countries signed in 1948. This document, as you might already know, articulated an array of principles regarding humans across the world.
It declared: "No one shall be subjected to torture or to cruel, inhuman or degrading treatment or punishment." It also stated: "Everyone has the right to life, liberty and security of person."
You might want to look into what was happening in the United States of America in the late 40s. Were people of color secure from "degrading treatment or punishment"? Did people of color possess "security of person"?
With human rights, you might want to look at how the rhetoric aligns or doesn't align with human rights policies. You could argue that the United States' role in defeating Nazi Germany put them on the side of human rights. Yet you could argue that they too committed human rights abuses with their excessive bombing campaigns in major German cities.
Such a pattern continues throughout history. Countries tout themselves as defenders of human rights only to perpetuate human rights abuse themselves.
Think about how George W. Bush presented his wars as battles for freedom and democracy. Compare his rhetoric with his policies. Did Bush's administration not subject people to "torture or to cruel, inhuman or degrading treatment or punishment"?
When the United States tries to stop human rights abuses, it does so rather unevenly. Many countries commit human rights abuses, yet only some seem to be punished. In 2011, Barack Obama championed a NATO-led military campaign in Libya to stop human rights abuses. Why didn't Obama/NATO support a military campaign in Israel to stop their documented abuses?
One might argue that human rights is more of a rhetorical strategy than a practice. Countries can violate human rights if they have the right alliances and talking points. Countries can also try and stop other countries from violating human rights if those violators don’t have the right alliances or talking points.