Question

Why the story teller say that these americans are Buena gente

Answer 1

because they were good people and when they knew that Don anselmo had more land what he had said before and these Americans were ready to pay more money what they had quoted first to buy the land.
hope this answer helps u

Answer 2

Don Anselmo stood up. “We have all learned to love these Americans,” he said, “because they are good people and good neighbors. I sold them my property  

because I knew they were good people, but I did not sell them the trees in the orchard.”