In 1916, President Woodrow Wilson signed into law the National Defense Act, expanding the size and scope of the U.S.National Guard.In 1965, Edward H. White II, an astronaut on Gemini IV, became the first American to walk in space.In 1979, the Ixtoc I oil well in the Gulf of Mexico blew out, spilling more than 126 million gallons of oil over an area of 1,100 square miles....