According to Graham Allison book, Nuclear Terrorism, only 5 percent of daily cargos into the U.S are screened where every day 30,000 trucks, 6500 rail cars and 140 ships deliver over 50,000 cargo containers into the United States. This rarely involves physical inspection which may not detect nuclear weapons and fissile materials.
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The French had better relationships with the Native Americans than most other Europeans because they didn't treat them badly. Instead they converted to their religion and didn't push them off of their land like the Spanish did.
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Reconstruction was the period between the end of the Civil War in 1865 and 1877, when the Democrats returned to power in the southern states. During this period, Republicans tried to guarantee a whole series of civil and political rights to African Americans, such as citizenship, the right to vote, and social equality against whites.
But when Reconstruction ended, all the advances in this regard were put aside by the Democrats, who established a segregation system based on the Jim Crow Laws, which, although they guaranteed African Americans certain rights (since they were established in the 13th, 14th and 15th Amendments to the Constitution), made them inaccessible and of much lower quality than those of the whites. In addition, a series of mechanisms of institutional violence were established, such as the Klu Klux Klan, through which African Americans were even more limited in their rights.
