The British promised the African Americans freedom from the white man that enslaved them.
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Answer is d. abolitionist
The Twenty-sixth Amendment lowered to voting age to 18.
Many campaigners used "Old enough to fight, Old enough to Vote".
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Answer;
Vikings accepting Christianity
Most important event during the period of European invasions is the vikings accepting Christianity.
Explanation;
At the beginning of the Viking Age, almost the entire population of Scandinavia was pagan, however the vikings had many Gods and it was not a big deal for them to accept the Christian god alongside their own.
The conversion of Vikings to Christianity occurred without violence, by the end of the Viking age most vikings had become fully Christian and were baptized and buried in that faith.