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.
San Francisco Bay is in the U.S. state of California, surrounded by a contiguous region known as the San Francisco Bay Area (often simply the Bay Area), dominated by the large cities San Francisco, Oakland, and San Jose.The waterway entrance to San Francisco Bay from the Pacific Ocean is called the Golden Gate.Across the strait spans the Golden Gate Bridge. The bay was designated a Ramsar Wetland of International Importance on February 2, 2013.he waterway entrance to San Francisco Bay from the Pacific Ocean is called the Golden Gate. Across the strait spans the Golden Gate Bridge. The bay was designated a Ramsar Wetland of International Importance on February 2, 2013.