How did the Open Door Policy differ from the policies of otherimperialist nations?

I don't really understand your question

 Imperialism is a policy or ideology of extending the rule over peoples and other countries, for extending political and economic access, power, and control, often through employing hard power, especially military force, but also soft power. The Open Door Policy protected equal privileges for all countries trading with China and for the support of Chinese territorial and administrative integrity.

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norsemen from northern countries had made earlier journeys

a)scientists

explanation:

the national defense education act had two main goals. the first one was to provide personal that was oriented to defense, including scholars, engineering students and so on. the other goal was to provide financial assistance for the students who would be enrolling at colleges and universities in the 1960s.