The UN Charter is the foundation of everything the #UnitedNations does, laying out the shared principles that guide international cooperation — peace, human rights and respect for international law. “The UN represents symbolically the idea of collective security, the idea that we are all together in the plight of humankind. And that we cannot act separately. We have to be unified.” Ahead of Friday’s #CharterDay, watch as historian and author Stephen Schlensiger explains why the UN Charter is so significant for our lives, “something we should all treasure for future generations.”