Unity Day is a public holiday observed in Zambia every first Tuesday of July, following Heroes' Day. Established to promote national unity among the country's diverse population, which includes over 70 ethnic groups, the day emphasizes solidarity among various ethnolinguistic groups. The official slogan, “One Zambia, One Nation,” was proclaimed by Kenneth Kaunda, Zambia's first President. Celebrations typically include official speeches by the incumbent President, who reflects on the historical unity among different ethnic groups during the struggle for independence. As a non-working day, Unity Day serves to remind Zambians of their shared identity and collective achievements.