European aggressor nation

During the Progressive Era, a period of significant social activism and institutional reform from the 1890s through the 1920s, political actors in the United States adopted four constitutional amendments in a short span of roughly 10 years: the Sixteenth Amendment, authorizing a direct income tax

Explanation:

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

answer: your option is d

explanation: