I am reading Jared Diamonds book Guns, Germs and Steel, and while the book does a great job of explaining the geographical and biological prerequisites that allowed agriculture to develop in Eurasia, it has been heavily critiqued for ignoring all cultural and/or social reasons. While I have read many people stating this, they rarely mention any concrete examples. So what were the major social differences that allowed Eurasia to adapt to agriculture faster than America?
Are you asking about imperialism or agriculture?
I assume that by "Eurasia" you are also including North Africa? Egypt had lots of agriculture and imperialism.
There was also agriculture in the Americas and sub-Saharan Africa although I don't know enough about agriculture to compare it to agriculture in Eurasia, I do know that in the modern context areas like the Canadian Prairies are not really worth farming without modern technology.
What would be a definition of "imperialism" that would exclude the Aztecs for example?