Traditional homelands of Tajik people included present-day Tajikistan, Afghanistan and Uzbekistan.
The territory that now constitutes Tajikistan was previously home to several ancient cultures, including the city of Sarazm of the Neolithic and the Bronze Age, and was later home to kingdoms ruled by people of different faiths and cultures, including the Oxus civilisation, Andronovo culture, Buddhism, Nestorian Christianity, Zoroastrianism, Manichaeism and Islam.
Many Tajiks also speak Russian as their second language.
While constitutionally a secular state, Islam is practiced by 98% of the population.
Cultures in the region have been dated back to at least the 4th millennium BCE, including the Bronze Age Bactria–Margiana Archaeological Complex, the Andronovo cultures and the pro-urban site of Sarazm, a UNESCO World Heritage site.
Some authors have also suggested that in the 7th and 6th century BCE parts of modern Tajikistan, including territories in the Zeravshan valley, formed part of Kambojas before it became part of the Achaemenid Empire.