Immigration to Uruguay began in several millennia BCE with the arrival of different populations from Asia to the Americas through Beringia, according to the most accepted theories, and were slowly populating the Americas. The most recent waves of immigrants started with the arrival of Spaniards in the 16th century, during the colonial period, to what was then known as the Banda Oriental.
Throughout its history, Uruguay has experienced massive waves of immigration from all around the world, specifically from the European continent, and today 90–95% of the Uruguayan population has European ancestry. The largest of these waves of immigration occurred between the last third of the 19th century and World War II, when the whole European continent was in turmoil. The largest groups of immigrants in Uruguay are the Spanish and Italians, both establishing the backbone of modern-day Uruguayan culture and society.