A suggestion of a Brazilian Ground forces tech tree+ some Argentinian and Chilean tanks, and other South America tanks too. The tiers that are lacking are rank 3 and top tier, so, if needed, a portuguese sub-tree could be added.
| M8 Greyhound
Reserve (1.0) .png)  | ||
| M3 Stuart
1.7   | ||
| M3A1 Stuart
2.3 .png)  | ||
| VBB-1
Reserve (1.0)   | ||
| T17 Deerhound
1.7   | ||
| CRM
2.3   | ||
| EE-T4 Ogum .30
1.0 +1 | ||
| Tractor de Artillería Yacaré
1.3   | ||
| M3 (75)
1.3 | ||
| VBB-1 (Spare)
1.0   | ||
| M8 (M8 rockets)
2.0   | ||
| EE-9 M2 (37)
2.7   | ||
| Crusader (105)
3.0 | ||
| M3A3 Lee
2.7   | ||
| XM3D1
3.0   | ||
| Nahuel DL.43
3.0 | ||
| M24
3.7 | ||
| M3A5 Lee
2.7 .png)  | ||
| Nahuel DL.43 (early)
3.0   | ||
| M8 IME
5.7   | ||
| Crusader (75)
4.0   | ||
| EE-11 Quilha (76)
5.7   | ||
| M4 Sherman
3.7   | ||
| M4 Composite
3.7   | ||
| EE-9 (20)
4.3   | ||
| Sherman Firefly
4.7 | ||
| VCTP
5.3   | ||
| M4 "Vovô"
3.7   | ||
| M4A1E9
4.0   | ||
| M41B
6.0 | ||
| X1A2 Carcará
6.3   | ||
| EE-9 Cascavel M4
6.3   | ||
| EE-9 M2 (90)
6.7   | ||
| M113 Oerklion
5.7   | ||
| M4 Repotenciado
6.0   | ||
| TAM VCA
6.3   | ||
| EE-11 Uruvel
6.0   | ||
| X1A1 Carcará
6.3   | ||
| M41 (60 HVSS)
7.7   | ||
| M-51 (Chile)
6.0   | ||
| M41UR
7.0   | ||
| X1 Pioneiro
7.0   | ||
| M41C Caxias
7.0 | ||
| MB-3 Tamoyo I
7.7   | ||
| EE-3 Jararaca
7.0   | ||
| Urutu FVT 925-T
7.3   | ||
| EE-9 Cascavel M7
7.7   | ||
| M60A3 TTS
8.7   | ||
| EE-11 Urutu TA-20
7.0   | ||
| VBTP-Guarani
7.3   | ||
| M24 HVMS 60mm
7.3   | ||
| M60 Sherman
7.3   | ||
| Charrua
7.3   | ||
| XLF-40
8.0   | ||
| X1 (60)
7.7   | ||
| MB-3 Tamoyo III
9.3   | ||
| EE-9 TORC-30
8.0 | ||
| EE-17 Sucuri
8.0   | ||
| Leopard 1A5BR
9.0   | ||
| Gepard 1A2
8.7   | ||
| JaPz.K A2
8.3   +1 | ||
| TAM
8.7   | ||
| Tamoyo II-105
8.3   | ||
| TAM 2IP
8.7   | ||
| EE-9U Cascavel
9.3   | ||
| EE-18 Sucuri II
9.7 | ||
| VBC Centauro II
11.0   | ||
| EE-T1 Osório
10.0   | ||
| EE-T2 Osório
10.7   | ||
| Marder Roland 2
10.3   | ||
| TAM 2C
9.7   | ||
| Leopard 2A4
10.0   | ||