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.
12th Mission Santa Cruz Mission is located at School & Emmet. It was build in 1791, rebuilt in 1931 Mission Santa Cruz today is an unassuming structure with a circular water fountain and park grounds in a largely residential area. The mission was the 12th of around 21 missions in Alta California (today's state of California versus Baja California, Mexico.)