Open Door Notes to imperialist nations were about

The notes were letters addressed to the leaders of imperialist nations proposing that the nations share their trading rights with the United States, thus creating an open door. This meant that no single nation would have a monopoly on trade with any part of China.

Explanation:

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on this day in 1833, president andrew jackson announces that the government will no longer use the second bank of the united states, the country's national bank. a national bank had first been created by george washington and alexander hamilton in 1791 to serve as a central repository for federal fund

the term is einsatzgruppen