In 1492, Christopher Columbus went to the court of Isabella of Castile and Ferdinand of Aragon, asking for help in an enterprise to sail west and reach the Indies. The King and Queen are not convinced, and Columbus leaves for France where his luck is no better.
The discovery of Brasil
In 149?, a Portuguese expedition coming back from the Indic Ocean reaches the shore of Brasil (OTL South America).
The discovery of Cabotia
In 149?, an English expedition reaches the shore of Cabotia (OTL North America).