The twelve tables consolidated earlier traditions into an enduring set of laws.
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President Nixon sent Kissinger for secret talks in China in 1971, pursuing the normalization of relations between two countries and having official consecutive visit by President Nixon in 1972. The reason was to put pressure to the Soviet Union to also improve the relations to U.S.
Federal courts system and the office of Attorney General.
Most European countries were in expansion of conquest, and Africa was a found ground for it. Many Africans were kidnapped from Western Africa and brought to Portugal. But a reason can be for the economic prosperity the slave trade brought to those countries.
Slaves were contributing to the Southern war effort by providing food, supplies, and manual labor.