Europe and later Africa exported, unintentionally, more than a dozen diseases that killed large numbers of American natives. Some, like measles and chickenpox, were childhood diseases that usually did not cause many deaths in the Old World but killed millions of American natives.
Mission Bay (San Diego) Mission Bay is a saltwater bay or lagoon located south of the Pacific Beach community of San Diego, California. The bay is part of the recreational Mission Bay Park, the largest man-made aquatic park in the country, consisting of 4,235 acres (17.14 km2), approximately 46% land and 54% water. The combined area makes Mission Bay Park the ninth largest municipally-owned park in the United States.
Mission Bay Park is the largest aquatic park of its kind in the country. It consists of over 4,600 acres in roughly equal parts land and water. Mission Bay boasts 27 miles of shoreline, 19 of which are sandy beaches with eight locations designated as official swimming areas. Mission Bay was originally named False Bay by Juan Rodriguez Cabrillo, who came upon it in 1542. In those days, it was a vast tidal marsh that could confuse mariners into believing it was the larger bay just to the south, San Diego Bay.