during the 19th century, there were several ideas among Europeans that legitimized imperialism. Those ideas were, for example, nationalism, racism, and social Darwinism. What were those ideas and how could they legitimize imperialism?

Imperialism had consequences that affected the colonial nations, Europe, and the world. It also led to increased competition among nations and to conflicts that would disrupt world peace in 1914. ... In the first half of the nineteenth century, colonialism became less popular.

Explanation:

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i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration