1822: Brazil split is an alternate history timeline that deals with Brazilian history, politics and slavery in 19th century. In OTL, Brazil was created after a rather conservative process of independence of Kingdom of Brazil from Portugal, which allowed it to remain united after a few local conflicts (unlike Spanish colonies, which split into several different countries). This ATL considers that this was only possible due to the strong figure of d. Pedro I, Prince Regent of Portugal, which rebelled against his father's rule and gave rise to this process, which he commanded himself, and later ruled over newly-created Brazil as an Emperor. But had Pedro left Brazil as he was ordered to, things would turn out to be very different.
Plot and Point of Divergence
In late 1821, Prince Regent Pedro, from Portugal, was ordered to leave his duties as the Regent of Kingdom of Brazil by his father, king João VI of Portugal. In Jan 9, 1822 he announced, unlike OTL, his decision to comply with his father's demands and returned to Portugal, which led to a whole set of independence wars all over Brazil. In the lack of a strong leader to unite the old colonies, they soon split into several small, independent countries.
Background
Note: The events which are related here are actual OTL history, until Pedro's return . If you are not familiar to Brazilian History, please read on, as this section adds up to the context.
The regions that formed Portuguese America had been explored by Europeans since 1500. Due to the huge size of the colonies and the lack of resources from Portugal, a system of captaincies was established, which led to a strong feeling of autonomy among colonists. Sailing logistics made it difficult to create a unified government, so Portuguese king Filipe II established two colonial states: State of Maranhão and Grão Pará in the North, and State of Brazil in the South. State of Brazil was later split into two administrative regions: Northern State (with a capital at Salvador) and Southern State (with a capital at Rio de Janeiro).
Although General Governors were appointed, captaincies retained much of their autonomy throughout colonial times, as they all relied on their Captain-majors (Donatários, in Portuguese) for their supplies. Only a few captaincies actually prospered from the beginning: Pernambuco, São Vicente and Bahia, all of which relied on cane sugar production and in massive African slavery. As of 1822, these regions (by then, provinces) were still the wealthiest of all colonies, and each one would eventually turn out to be the head of a country: Pernambuco, São Paulo and Bahia, respectively.
In the verge of 19th century, Portuguese colonies (which were called collectively Brazil) had overcome a few major crises, and a steady recovery was on the way. A few rebellions broke down, inspired by the Enlightenment and by the Independence of the United States, especially in Minas Gerais, Bahia and Pernambuco, which were all harshly suffocated by the Crown's forces.
The Portuguese court's arrival
After being threatened by French Emperor Napoleon Bonaparte with dethroning if he defied Bonaparte's boycott to Great Britain, Portuguese Prince Regent d. João decided to leave Portugal and transfer his court to Brazil in 1808. The arrival of the Court changed the colonies dramatically, especially the town of Rio de Janeiro. As a first measure, D. João allowed "friendly nations" (i.e. Great Britain) to trade with Brazil, and added up several improvements to the parochial village.
In 1814, D. João was faced with the need to return to Portugal, so he might send an embassador to the Congress of Vienna . But he feared that his leaving Brazil would turn out to be disastrous: his counselors sensed a growing feeling of autonomy among colonists and greater animosity toward Portuguese rule, and a rebellion was believed to burst out if the Regent left the colony. To solve the dilemma, d. João turned Brazil into a kingdom, united to Portugal, in 1815. The next year, d. Maria I, Portugal's queen and d. João's mother, died, so the Regent became king João VI of Portugal.
King João's departure
In 1820, Liberal Revolution arose in Portugal, and the rebels demanded the king's immediate return to the country. The threat to his power by Napoleon was long gone, most of the noblemen and courtisans who had fled in 1808 had already returned, and the Portuguese people were demanding political reformations. D. João VI was faced again with the dilemma of returning to Portugal and risking Brazil or staying put and risking his throne. His fears of rebellions in Brazil, however, were even greater than previously, so he chose to return to Portugal whilst leaving his son and heir, Pedro, as the Regent of Kingdom of Brazil. This clever gambit kept him his dominions intact, but infuriated the Portuguese as soon as the royal ship arrived at Lisbon.
As soon as he arrived, d. João was forced to demand his son's immediate return. Thus, it was now Pedro who had to face the same dilemma as his father's: either comply to his father's royal order and return, but risking impredictable consequences to their power over Brazil, or rebelling against his king and staying, and risking his very crown in Portugal.
Pedro's return
See main article: The 'Leaving Day'