The International Congress of Americanists (ICA) is the largest congress of its kind in the world, each time attracting several thousand researchers. It has taken place every year since 1875; since 1976 the conference venue has rotated every three years between Europe and Latin America. The congress has focused on a range of themes over the years, such as archaeology, ethnology, ethnohistory, cultural studies, industry, history, linguistics, anthropology, politics and the transformation of states, religious studies, cultural and social anthropology.