Which Texas rancher was among the first to move cattle from the open range into fenced land

Mifflin Kenedy

Explanation:

He was one of the greatest entrepreneurs present in South Texas, being very influential in the agricultural sector. He is considered one of the first to move cattle from the open field to fenced land, a practice that is widely used today and which allowed cattle to become an economic success in the agricultural sector.

His influence was so great that the city of Kenedy was named after him.

Mifflin Kenedy was a Texas rancher.

He was among the first to move cattle from the open range into fenced land circa 1869.