Which european country sent the most settlers to brazil?

Portiugal because Spanish came to Brazil from the country of Portugal! 

Brazil speaks Portuguese so we can see some influence here. Definetly Portugal was the one who sent the most settlers here. Behind them were the French, who wanted to form a colony here called Antarctic France, the French settling was commanded by Villegaignon. The reason why Spain didn't make Brasil a colony was because of a treaty the made with Portugal called the Treaty of Tordesilhas, establishing the borders and limits of each country's colony.

In the midwest because it has more moderate climate than the north or south west which makes farming far easier.