The first human migrants to America are about to cross the land bridge between Eastern Russia and Alaska. The navigator seems a bit lost. The year is 13,000 BC. The first human migrants to America are about to cross the land bridge between Eastern Russia and Alaska. The navigator seems a bit lost. ""You alright?"" They ask him, waiting eagerly at the shore with a distant view of the new lands that awaited them. ""Yeah, I think so,"" the navigator replies, staring intently at some kind of primiti…