The population was gradually increasing, dedicating itself to the production of provisions, and the quantities that reached the port of the capital in the boats of Macoris in the years 1868 to 1875, which were baptized there to the old fishermen's abode, were so great.

In 1852 Macorix is elevated to military port, this time depending on the common Hato Mayor, being Norman Maldonado his first commander in arms.

On October 1, 1856, the first Catholic church was founded by Father Pedro Carrasco Capeller, a native of San José de los Llanos, who came to officiate Mass from Hato Mayor.

This is where the patron saint festivities are born, starting on June 22 and ending on the 29th of the same month San Pedro de Macoris experienced a significant wave of migration in the late 19th century from Cubans who were fleeing their country's War of Independence.

San Pedro de Macorís reached its peak during the first quarter of the 20th century, when its sugar production enjoyed high prices on the international market as a result of the First World War.

San Pedro de Macorís pioneered many areas such as the first firefighting corps, the first national baseball championship, the first town to have telephone and telegraph centers, the first racetrack and the first boxing coliseum, among others.

The intellectual culture surged at the same pace with schools and the press; among the first newspapers were "Las Novedades", "Boletín", "La Locomotora" and "El Cable."

Although the species grew in Hispaniola already its use was introduced and spread by immigrants from the Eastern Caribbean where colonists had discovered it as a substitute for myrtleberry-infused schnapps.

San Pedro de Macorís has a tropical savanna climate (Köppen Aw) with consistently hot temperatures and a dry season from January to March.