The document outlines several key factors that contributed to the development of Philippine nationalism: 1) The opening of the Philippines to world commerce in the 1800s exposed Filipinos to new liberal ideas and allowed a middle class to develop who could educate their children. 2) Racial prejudice by Spanish colonizers who saw Filipinos as inferior, the influx of liberal ideas from books and magazines, and the secularization movement all challenged Spanish rule. 3) Events like the Cavite Mutiny in 1872 and the execution of priests Gomburza in 1872 further galvanized nationalist sentiments. Propagandists like Rizal and Lopez Jaena advocated for reforms through writing and speeches.