Because they had to walk through all the seven continents with no known transportation
They had to walk from Africa to north-east Russia, then into North America and down south.
Mayans
Crops
most used rafts across the pacific ocean to get to south america; other early humans came across the Bering Strait which once had a land bridge, then made their way further afield.
'America' - the whole continent - was named after Amerigo Vespucci, an early expolorer of South America.
Climate,geography,and resources.
If you travel south of South America far enough, you will reach the continent of Antartica.
Until the end of south america
Antarctica
He was the first person to reach the South Pole, and he was also the first to reach both the South and the North Poles. He was one of the first people to fly from Europe to America.
i think that they migrated south because that was the only way that they had to get their food and also get clothing.
Early Americans initially settled in North America.
If you head south from South America you would reach the continent of Antarctica.