In 1748, Lord Fairfax hired which 16-year-old to help survey his lands in the Shenandoah Valley?

In 1633, Descartes held back his book "The World" after which Italian scientist was condemned by the Inquisition? In 1709, Sweden lost to which Russian czar at the Battle of Poltava, ending its dominance in the Baltic region? In 1719, which small principality was formed by uniting the counties of Vaduz and Schellenberg? In 1725, Peter the Great commissioned which Danish navigator to explore the Pacific coast of Siberia? In 1773, which ex-printer and inventor published "Rules by Which a Great Empire May Be Reduced to a Small One"? In 1779, which college became the first in the U.S. to offer professional training in law? In 1789, which became the first U.S. holiday designated by presidential proclamation? In 1793, which Irish university college allowed Catholics to take degrees for the first time?