The correct answer is Malaria
Malaria was a huge problem since it couldn't be treated and people mostly died from it. It prevented numerous explorers from venturing into places like Africa where Malaria was running rampant due to the huge amount of mosquitoes. When it was discovered, it enabled numerous people to live at ease because they could not live with the disease or prevent getting it.
Johnson was unwillingly caught up in the hot battle (Vietnam War) of the Cold War. Johnson was the US's only Presidential Administration to be destroyed by the war. He went on nation wide television and flat out said he would not run for president again, and would NOT ACCEPT nomination for the presidency of the United States. He was truly fed-up with the war.
The Great Depression had started; including an immense bank crisis. Franklin Roosevelt's mandate as a first-term President was clear and challenging: rescue the United States from the throes of its worst depression in history. Economic conditions had deteriorated in the four months between Franklin Roosevelt's election and his inauguration. Unemployment grew to over twenty-five percent of the nation's workforce, with more than twelve million Americans out of work. A new wave of bank failures hit in February 1933. Upon accepting the Democratic nomination, Franklin Roosevelt had promised a "New Deal" to help America out of the Depression, though the meaning of that program was far from clear.
I think it is the legislative branch <span />
