How many years has it been since 1620?

In what ways did the people of the Americas create advanced civilizations? What is the origin of the name Powell? How were law and order maintained in medieval Europe? What is the best tense to use past perfect tense or past perfect progressive tense? Where did the name wyche originate? What was one of the most important occupations in monasteries during the middle ages? What did the crusaders bring back home with them? What kind of utensil's did the medieval times use? What are the 7 aspects of civilization? What roman leader impacted the spread of Christianity the most? Who was Sir Walter Raleigh and what happened to his colony at Roanoke? How many years are in are in 4 decades? Where did the name Langton originate? Who was the viking god of wind rain farming and war? What would woman do when the men were gone fighting in then crusades? What is the name of the ghost in the madrona manor? What is an event that happens every thirty years called? What and when were the Crusades? What was the significance of the crusades and the impact it had on the west and Muslim societies? Was the fountain pen was invented by W B Purvis?