1231 - Harderwijk (Netherlands) becomes a city
1517 - Sir Thomas Pert reaches Hudson Bay
1578 - England grants Sir Humphrey Gilbert a patent to explore & colonize North America
1770 - Capt James Cook discovers Great Barrier Reef off Australia
1838 - Iowa Territory is organized
1891 - Puerto Rican flag adopted
1901 - Cook Islands annexed & proclaimed part of New Zealand
1955 - 1st magnesium jet airplane flies
