The document discusses challenges to Spanish authority in the Philippines from 1560-1820, including revolts by Filipinos against Spanish rule and threats from other colonial powers. It provides details on Portuguese attempts in the 1560s-1570s to displace the Spanish and Dutch attacks from 1597-1647. It also lists numerous Filipino revolts from 1574-1744, their causes and leaders, and why they ultimately failed, including lack of unity and inadequate preparation. Resistance continued longest among Moro groups in the south and in mountainous interior regions.