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This is an expression is used by Army leaders. The "know" means that the leaders should be people who will sacrifice and want to learn. They must do this so that they can properly train others.
He wanted them in Cuba because they were a small but effective team.
Answer:
Plessy v. Ferguson, legal case in which the U.S. Supreme Court, on May 18, 1896, by a seven-to-one majority (one justice did not participate), advanced the controversial “separate but equal” doctrine for assessing the constitutionality of racial segregation laws