Nomads who eventually came to be known as American Indians first reach the continent by:
Over a land bridge that crossed the Bering Strait.
Explanation:
There are several theories that exist, quite one in all that might be correct. Maybe. ;) this can be what i learned. They stumbled on the land bridge and ice across the northern Bering Sea from Asia. The ice bridge went from western Asia to Alaska throughout the glacial period concerning thirty five,000 years past.
Some of theses changes should occur when there is no war going on. This is to make the country be modernized by the technology. If there is a war going on, the improvement of each technologies will be lessen and could possibly be stopped.