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.
Slaves were forbidden to leave the owner's property unless they were accompanied by a white person or had permission so in other words to keep them in check.
The anti-federalists (i.e., Patrick henry and sam adams)
Return to normalcy would be the answer
He had openly stated in one of his letters that he would like to have full control of the Kongo-Portuguese slave trade. However, he was opposed to slavery and actually fought with the Portuguese.