Viking Empire of America

Introduction
Warning: I'm not british neither american so, sorry for my poor english.

In this scenario, vikings colonize North America developing, expanding and prospering. But... how will they survive against native american tribes? How did they developed new tecnologies? Let's go with a decent pace people! All of this started in ...

10th Century : Fast growth and humble start...
Leif Erikson (According to this timeline) arrives in modern day Norfolk in East virginia in 1035, Poor families from Scandinavia and Thralls (The lowest class, the slave) fled to the new town.

1037 A.C. : The norse meet the Shawnee tribe, they remain peaceful (For now), and the city becomes an oligarchy guided by Erikson family's members.