The History of International Migration Site from the Netherlands' Leiden University has a simple index of migration batters from prehistory to present-daytracking who went where, when. It'd be great to be able to cross-reference this by country of origin and destination, too — but it's still utterly fascinating reading.
Migration to Latin America, 1750-1914
Spain
* 1600-1900: Southern Spain – Andalusia (especially Seville and its hinterland) – consistently provided the largest number of emigrants of any single region.)* 1600-1900: Spanish society in the Indies reflect a wide socio-economic representation in the settlement of the New World: only the extremes of Spanish society – the highest nobles who commanded great wealth and resources, and the true paupers scarcely participated in the movement.
* 1850-1920: Spaniards moving to Argentina were poor, rural and looking for a permanent place for resettlement. (Survey, 216)
* 19th- 20th century: Especially emigrants from Spain went to South America. Portugal
* 1850-1900: The first group Portuguese (8-11%) composed of adolescents and young adults who went to join relatives or 'friends' to work in trade activities. This group departed almost exclusively from the northern regions of Portugal. The second group (ca. 10%) is relatively older, and is formed by those that had some sort of property or skill, and could easily find a niche in the expanding Brazilian urban economy. The third group (ca. 80%) is made up of those with no skills, who entered the Brazilian unskilled labour market.
* 19th- 20th century: Especially emigrants from Portugal went to South America.
(via Making Light)