What is by the phrase in 1900 Europeans believed the world was their oyster?

The phrase "the world is their oyster" suggests that Europeans in 1900 felt they had limitless opportunities and resources at their disposal, reflecting a sense of dominance and entitlement during the height of Imperialism. With vast colonial empires, technological advancements, and economic growth, many believed they could exploit global resources and territories to their advantage. This mindset contributed to the expansion of European influence worldwide, often at the expense of colonized nations and peoples.