How did major events of the first half of the 20th century become the spark for decolonization

After World War II, European countries lacked the wealth and political support necessary to suppress far-away revolts. They could not oppose the new superpowers the U.S. and the Soviet Union's stands against colonialism. Strong independence movements in colonies

the reform movements that arose during the antebellum period in america focused on specific issues: temperance, abolishing imprisonment for debt, pacifism, antislavery, abolishing capital punishment, amelioration of prison conditions (with prison's purpose reconceived as rehabilitation rather than punishment), the humane treatment of animals, the humane and just treatment of native americans, the establishment of public institutions for the care of the destitute, orphans, blind, and mentally ill, the establishment of public schools, the abolition of tobacco use, vegetarianism, health reform, homeopathic medicine, woman's rights (including, at first, especially the establishment of a woman's right to own property apart from her husband and her right to sue for divorce), and the amelioration of labor conditions (including higher pay, the right to form unions, the right to strike, and the demand for limits on the number of work hours, and safe working conditions).

explanation:

four sitting presidents have been assassinated while in office but the first was abraham lincoln,