Brazil
Brazilian dialects are divided into a northern and southern groups, where the northern dialects tend to slightly more open pre-stressed vowels. Due to the economic and cultural dominance of São Paulo and Rio de Janeiro in Brazil, their dialects end up having some influence on the rest of the country. However, thanks to the migration from the Northern states to the Southern states, this influence can be seen as a two-way phenomenon. Cultural issues also play their roles and speakers of the Gaúcho accent, for example, usually have strong feelings about their own way of speaking and are largely uninfluenced by the other accents. Also, people of inner cities of Santa Catarina state and Paraná state usually spell with a very notable German, Italian or Polish accent, while among the inhabitants of the Santa Catarina island predominates the Azorean Portuguese dialect in its local variant.
Between Brazilian Portuguese, particularly in its most informal varieties, and European Portuguese, there can be considerable differences in grammar, aside from the differences in pronunciation and vocabulary. The most prominent ones concern the placement of clitic pronouns, and the use of subject pronouns as objects in the third person. Non-standard inflections are also common in colloquial Brazilian Portuguese.
Read more about this topic: Portuguese Dialects, Main Subdivisions