Philippine–American War: Malolos, capital of the First Philippine Republic, was captured by American forces.

The Philippine–American War, known alternatively as the Philippine Insurrection, Filipino–American War, or Tagalog Insurgency, emerged following the conclusion of the Spanish–American War in December 1898 when the United States annexed the Philippine Islands under the Treaty of Paris. Philippine nationalists constituted the First Philippine Republic in January 1899, seven months after signing the Philippine Declaration of Independence. The United States did not recognize either event as legitimate, and tensions escalated until fighting commenced on February 4, 1899, in the Battle of Manila.

Malolos, officially the City of Malolos, is a component city and capital of the province of Bulacan, Philippines. According to the 2024 census, it has a population of 269,809 people. It is the capital city of the province of Bulacan as the seat of the provincial government.

The Philippine Republic, now officially remembered as the First Philippine Republic and also referred to by historians as the Malolos Republic, was a state established in Malolos, Bulacan, during the Philippine Revolution against the Spanish Empire (1896–1898) and the Spanish–American War between Spain and the United States (1898) through the promulgation of the Malolos Constitution on January 23, 1899, succeeding the Revolutionary Government of the Philippines. It was formally established with Emilio Aguinaldo as president. It was unrecognized outside of the Philippines but remained active until April 19, 1901. Following the American victory at the Battle of Manila Bay, Aguinaldo returned to the Philippines, issued the Philippine Declaration of Independence on June 12, 1898, and proclaimed successive revolutionary Philippine governments on June 18 and 23 of that year.

The Capture of Malolos, also known as the Battle of Malolos, occurred on March 31, 1899, in Malolos, Bulacan, during the Philippine–American War. General Arthur MacArthur Jr.'s division advanced to Malolos along the Manila-Dagupan Railway. By March 30, American forces were advancing toward Malolos. Meanwhile, the Aguinaldo government moved its seat from Malolos to San Isidro, Nueva Ecija.