Final answer:
John Fiske's idea of Anglo-Saxonism was that the Anglo-Saxon race was superior and destined to spread their influence, values, and population throughout the world, promoting nationalism, colonialism, and imperialism.
Step-by-step explanation:
John Fiske's idea of Anglo-Saxonism promoted the notion that the English-speaking people, or Anglo-Saxons, were racially superior and therefore destined to expand their territorial, political, and cultural influence globally. Stemming from a nationalist fervor in 19th-century England, this ideology linked the glory of the Anglo-Saxon past with a destiny to spread supposed civilizing influences, which was a mixture of liberties, Christianity, and cultural dominance. These beliefs were compounded by claims to an uninterrupted Anglo-Saxon lineage from the era of the Anglo-Saxon kingdom in England, despite the centuries of invasion and rule by others such as the Normans.
Expansionists like Josiah Strong argued that Anglo-Saxons had a moral responsibility to bring their superior way of life to other nations, and this perspective fueled colonialism and imperialism. It influenced British attitudes towards its empire and the United States, with proponents like Fiske viewing English rule as a civilizing force and the extension of Anglo-Saxon territory as a benefit to humanity by increasing the Anglo-Saxon population and potentially ending wars.