i think its A modern humans
Economic productivity has declined in some countries as a result of : Bubonic Plaque
In the past, Bubonic plaque manage to kill about 25 - 30 % of the world population, these greatly decrease the number of workers that could contribute to production activity and reduce Overall economic productivity in several countries
The Emancipation Proclamation helped prevent the involvement of foreign nations in the Civil War because most Europeans were against the institution of slavery. Britain and France had considered supporting the Confederacy in order to expand their influence in the Western Hemisphere but failed to do so because the South supported slavery
I think the involvement would be a positive thing for the development of latin america.
Before the colonization, the countries in latin America were left behind in human development and technology. During the colonization, these countries managed to learn a couple of things and managed to evolve into a mores advanced country