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August 28, 1609 – Henry Hudson, an English navigator under the employ of the Dutch East India Trading Company, the first explorer to arrive in Delaware.
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21609 - Henry Hudson, an Englishman sailing for the Dutch East India Company, discovers Delaware Bay and River.
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1610 - Captain Samuel Argall, an English sea captain, names the bay and river after Lord De La Warr, the governor of Virginia.
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1631 - Dutch colonists settle at Zwaanendael (site of present-day Lewes).
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1638 - The first European colony in the Delaware Valley was established by Swedish settlers
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1655 - Swedish colonization began at Fort Christina (now Wilmington) in 1638, but New Sweden fell to Dutch forces led by New Netherlands' governor Peter Stuyvesant.
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1673 - The Dutch regain control of the Delaware.
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1674 - The English regain the Delaware
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1682 - The Duke of York transfers control of the Delaware Colony to English Quaker William Penn.
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1698 - Holy Trinity, Old Swedes Church, is built in Wilmington
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1717 - Town of Dover laid out.
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1731 - Thomas Willing founds Willingtown
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1739 - Willingtown receives royal charter and is renamed Wilmington.
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1742 - Oliver Canby builds flour mill on Brandywine River at Wilmington, beginning large commercial flour milling industry.
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1760 - 35,000 people lived in the Delaware region.
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1761 - James Adams sets up first printing press in Delaware at Wilmington.
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1763 - The French and Indian War ends in 1763 and Great Britain gains controls of all lands previously held by France. England pays for the war by increasing taxes on its American Colonies. Restrictions on the colonists eventually lead to a fight for independence from the crown.
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1765 - Caesar Rodney and Thomas McKean represent Delaware at the Stamp Act Congress.
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1767-68 - John Dickinson writes Letters from a Farmer in Pennsylvania, an influential protest against British policies towards the colonies.
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1774 - Caesar Rodney, Thomas McKean, and George Read represent Delaware at the First Continental Congress.
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1775 - Revolutionary War began
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1776 - June 15 - Delaware Assembly declares independence from England. This is the origin of the holiday called Separation Day.
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1779 - Delaware Assembly ratifies Articles of Confederation.
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1785 - Oliver Evans builds prototype automatic flour mill in Newport.Delaware Gazette, state's first newspaper, begins publication.
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1786 - Delaware is one of 5 states to send delegates to Annapolis Convention, which hoped to revise the Articles of Confederation.
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1787 - Dec. 7 - Delaware ratified the United States Constitution and became the 1st state in the Union.
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1905 - Delaware becomes last state to abolish use of the pillory.
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1941-45 - 30,000 Delaware men and women serve in armed forces in World War II.
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1951 - Delaware Memorial Bridge opens first span linking Delaware to New Jersey.
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2011 - Delaware passes Civil Unions Bill