What is associated with: 1783 war over didnt get canada 2day when i signed treaty of this but usa h2s?

What is associated with: 1776 george washington his troops cross this river to attack the hessians? Based on the clue '178 feet above sea level on the mississippi river ...', what is the answer? What is associated with: 1781 each state retains its sovereignty freedom and independence? What is associated with: 1783 his britannic majesty acknowledges the said us to be free sovereign and independent? What is associated with: 1787 81 yrs old penn snds me 2 cnst cnv im gttng 2 old fr thsstf lol? What is associated with: 1787 law governing the area north of ohio river it became a model for territories entering the… What is associated with: 1787 this state becomes the first to ratify the constitution? What is associated with: 1789 1797?