Portugal was a leading country in the European exploration of the world in the 15th century. The Treaty of Tordesillas in 1494 divided the Earth outside Europe into Castilian and Portuguese global territorial hemispheres for exclusive conquest and colonization. Portugal colonized parts of South America (Brazil, Colónia do Sacramento, Uruguay, Guanare, Venezuela), but also made some unsuccessful attempts to colonize North America (Newfoundland and Labrador and Nova Scotia in Canada).