In the previous chapter, we were told that the Canaanites were in the land. This time, it’s the Canaanites AND the Perizzites.
For historical context: the Canaanites lived in cities. “Perizzites” refers to rural villagers, who did not live in cities.
Perhaps the Canaanites represent the sin in our hearts, and this tells us that this sin doesn't merely present itself in the obvious big ways, but also in the small ways. The less obvious ways.
And there was strife between the herdsmen of Abram’s livestock and the herdsmen of Lot’s livestock. The Canaanites and the Perizzites then dwelt in the land.
Genesis 13:7 (NKJV)