The sinking or Lusitania on 7 May 1915 was a significant event during WW1. It was a passenger liner sunk by German submarine during World War 1. It lead to America declaring war on Germany.
New Imperialism, period of intensified imperialistic expansion from the latter half of the 19th century until the outbreak of World War I in 1914. The renewed push to expand territorial control included not only the earlier colonial powers of western Europe but also newcomers such as Germany, Italy, Japan, Russia, and the United States.
The Normans conquered Anglo-Saxon England in the year 1066. This marked one of the first and major changes of rule and supremacy in England that lasted well into the latter part of the millennium. <span />
Answer: C. the downing of an American U-2 spy plane over the Soviet Union.
The downing of the American spy plane in Soviet Union named U-2 contributed mostly to the cancellation of a scheduled summit between the Soviet Union's leader Nikita Khrushchev and that of President Dwight D. Eisenhower.