to detail what "achieving peace through strength requires". Territorial peace theory Proponents of the territorial peace theory claim that countries with stable borders are likely to develop democracy, while wars and territorial threats foster authoritarian attitudes and a disregard for democracy. Increasing attention has been paid to the theory since the early 2000s, and it has increasingly informed democratic peace theory and been espoused in the cause of peacebuilding and international relations. Proponents of democratic peace theory counter argue that stable borders resulting from dispute arbitration or negotiation rather than force via autocracy are more likely to be obtained by democratic states. Efforts are underway to sythesize the two theories. United Nations Charter and international law After World War II, the United Nations was established by the United Nations Charter to "save successive generations from the scourge of war which twice in our lifetime has brought untold sorrow to mankind" (Preamble). The Preamble to the United Nations Charter also aims to further the adoption of fundamental human rights, to respect obligations to sources of international law as well as to unite the strength of independent countries to maintain international peace and security. All treaties on international human rights law refer to or consider "the principles proclaimed in the Charter of the United Nations, recognition of the inherent dignity and the equal and inalienable rights of all members of the human family is the foundation of freedom, justice and "peace in the world". International Day of Peace The United Nations International Day of Peace, sometimes called World Peace Day, is observed annually on 21 September. It is dedicated to peace, and specifically the absence of war and violence, and can be celebrated by a temporary ceasefire in a combat zone. The International Day of Peace was established in 1981 by the United Nations General Assembly. Two decades later, in 2001, the General Assembly unanimously voted to designate the day as a day of preventing violence and a cease-fire. The celebration of this day is recognized by many nations and people. In 2013, for the first time, the day has been dedicated to peace education, i.e. by the key preventive means to reduce war sustainably. Religious views Many religions and religious leaders have expressed a desire for an end to violence. Baháʼí Faith The central aim of the Baháʼí Faith is the establishment of the unity of the peoples of the world.