Pan American Day, also known as Pan American Week, is the commemoration of the establishment of the Pan American Union on April 14, 1890. This day acknowledges and celebrates the unity, cooperation, and partnership of the countries in the Americas. Synonyms for Pan American Day include Pan Americanism, Inter-American Day, and Western Hemisphere Day. These terms all highlight the interconnectedness of the nations that make up the Americas. The celebration of Pan American Day reinforces the belief that collaboration among neighboring nations is essential for progress, development, and peace in the region.