Genesis Chapter 36 is Focused on Esau’s Descendants, Who is Edom

The reason of which one whole chapter is dedicated to Edom is to expose its incest and illegitimacy.

Moreover, evolving to Israel’s perpetual enemy — Amalek to Rome.

“The Chronicles of Esau”

And these are the descendants of Esau, he is Edom. Esau has taken his wives from among the Canaanite women: …
36:1-2
… these are the chiefs of Edom by their settlements, in the land of their possession – he is Esau, father of Edom.
:43

1 And these are the generations of Esau, that is, Edom.
2 Esau took his wives from the daughters of Canaan: Adah, daughter of Elon the Hittite; and Oholibamah, daughter of Anah, daughter of Zibeon the Hivvite;
3 also Basemath, daughter of Ishmael, sister of Nebaioth.
4 Adah bore Eliphaz to Esau and Basemath bore Reuel.
5 Oholibamah bore Jeush and Jalam and Korah; these are the sons of Esau who were born to him in the land of Canaan.
6 And Esau took his wives, his sons, and his daughters and all the people of his household, and his cattle and all his animals and all his property that he had acquired in the land of Canaan, and he went to a[nother] land, because of his brother Jacob.
7 For their possessions were too numerous for them to dwell together, and the land of their sojournings could not support them because of their livestock.
8 So Esau dwelt on Mount Seir Esau, that is Edom.
9 And these are the generations of Esau the progenitor of Edom, on Mount Seir.
10 These are the names of Esau’s sons: Eliphaz, son of Adah, the wife of Esau, Reuel, son of Basemath, the wife of Esau.
11 The sons of Eliphaz were Teman, Omar, Zepho, Gaatam, and Kenaz.
12 And Timna was a concubine to Eliphaz, son of Esau, and she bore to Eliphaz, Amalek. These are the sons of Adah, the wife of Esau.
13 And these are the sons of Reuel: Nahath, Zerah, Shammah, and Mizzah. These are the sons of Basemath, the wife of Esau.
14 And these are the sons of Oholibamah, daughter of Anah, daughter of Zibeon, the wife of Esau; she bore to Esau: Jeush, Jaalam, and Korah.
15 These became the chieftains of the sons of Esau: the sons of Eliphaz, Esau’s firstborn: Chief Teman, Chief Omar, Chief Zepho, Chief Kenaz,
16 Chief Korah, Chief Gaatam, Chief Amalek. These are the chieftains of Eliphaz in the land of Edom; these are the sons of Adah.
17 And these are the sons of Reuel the son of Esau: Chief Nahath, Chief Zerah, Chief Shammah, and Chief Mizzah. These are the chieftains of Reuel in the land of Edom; these are the sons of Basemath, the wife of Esau.
18 And these are the sons of Oholibamah, the wife of Esau: Chief Jeush, Chief Jaalam, Chief Korah. These are the chieftains of Oholibamah, daughter of Anah, the wife of Esau.
19 These are the sons of Esau and these are their chieftains, he is Edom.
20 These are the sons of Seir the Horite, the inhabitants of the land: Lotan, Shobal, Zibeon, and Anah;
21 Dishon, Ezer, and Dishan. These are the chieftains of the Horites, the sons of Seir in the land of Edom.
22 The sons of Lotan were Hori and Hemam, and the sister of Lotan was Timna.
23 And these are the sons of Shobal: Alvan, Manahath, and Ebal, Shepho and Onam.
24 And these are the sons of Zibeon: Aiah and Anah he is Anah who found the mules in the wilderness when he pastured the donkeys for his father Zibeon.
25 And these are the sons of Anah: Dishon and Oholibamah, the daughter of Anah.
26 And these are the sons of Dishan: Hemdan, Eshban, Ithran, and Cheran.
27 These are the sons of Ezer: Bilhan, Zaavan, and Akan.
28 These are the sons of Dishan: Uz and Aran.
29 These are the chieftains of the Horites: Chief Lotan, Chief Shobal, Chief Zibeon, Chief Anah,
30 Chief Dishon, Chief Ezer, and Chief Dishan; these are the chieftains of the Horites according to their chieftains in the land of Seir.
31 And these are the kings who reigned in the land of Edom before any king reigned over the children of Israel:
32 Bela, son of Beor reigned in Edom, and the name of his city was Dinhabah.
33 Bela died, and Jobab, son of Zerah of Bozrah, reigned in his stead.
34 And Jobab died, and Husham of the land of the Temanites reigned in his stead.
35 Husham died, and Hadad, son of Bedad, who defeated Midian in the field of Moab, reigned in his stead. The name of his city was Avith.
36 Hadad died, and Samlah of Masrekah reigned in his stead.
37 Samlah died, and Saul of Rehoboth by the river reigned in his stead.
38 Saul died, and Baal Hanan, son of Achbor, reigned in his stead.
39 Baal Hanan, son of Achbor died, and Hadar reigned in his stead. The name of his city was Pau; his wife’s name was Mehetabel, daughter of Matred, the daughter of Me zahab.
40 And these are the names of the chieftains of Esau, according to their clans, according to their places, by their names: Chief Timna, Chief Alvah, Chief Jetheth;
41 Chief Oholibamah, Chief Elah, Chief Pinon,
42 Chief Kenaz, Chief Teman, Chief Mibzar,
43 Chief Magdiel, Chief Iram. These are the chieftains of Edom according to their dwelling places in the land of their possession. That is Esau, progenitor of the Edomites.