Since when has international agriculture been around?

Question

I'm writing a speech and I can't really find details on when this started. I'm referring to trade that goes way back, i just don't know how far back.

Help please!

Answer 1

Agriculture developed around 9000BC. Trade is thought to have existed even further back than that so it is likely that people traded agricultral produce as soon as it became available

Answer 2

I would guess is goes back as far as there was more than one nation.  I don't think you will find a specific date. Trade in agricultural products was probably the first kind of international trade.