Though horses were domesticated 5-6,000 BP, warfare on horseback emerged much later ~3,000 BP. This required a new kind of horsemanship and horse-human relationship. Which horse culture invented warfare on horseback that required a close relationship?

The Eurasia culture (4000 and 3000 BC) is the first evidences of warfare on horseback.

Explanation:

Throughout the Ancient Near East, there was improved harness and chariot designs in 1600 BC. These were made made for chariot warfare.

An illustration of Sumerian shows that around 2500 BC there were some type of equine pulling wagons.

There were training manual written for war on horses which was a guide for training chariot horses written. This was earlier written about 1350 BC.

There was improved effectiveness of horses in battle which were due to improvements and inventions in technology. These included the invention of the saddle, the stirrup, and later, the horse collar.

what are you options

c. free trade can lead to low pay for workers in poorer countries.