southern blacks to northern cities
As far as I know, radar was invented by a Hungarian scientist named Zoltan Bay. That radar was first used in World War II by the British troops.
In the "War of Currents" era in the late 1880s, George Westinghouse and Thomas Edison became adversaries due to Edison's promotion of direct current (DC) for electric power distribution over alternating current (AC) advocated by Westinghouse and Nikola Tesla. Edison had major flaws in his DC machine. Tesla made it work right. Edison has the pattent. In few words looking back in time, research shows that Edison had his inventors working for him getting him the patents. Edison never had ideas like Tesla had.
The boy's father was a telegrapher so he gave Edison telegraph lessons. That is one of the reasons why Edison was improving at the telegraph. This also started him to becoming a telegrapher during the Civil War for the Union army.
In the "War of Currents", George Westinghouse and Thomas Edison became adversaries due to Edison's promotion of direct current for electric power distribution over alternating current advocated by Westinghouse and Nikola Tesla. AC was and it is the best system.
I think you mean operation overlord??? It is the American, Canadian and British offensive on Europe in World War 2. They landed in Normandy on 6th June 1944 (Commonly called D-Day, Day of Days or Deliverance Day) and progressed throughout France liberating Paris on the 25th August. This allowed the allies a foothold in Europe.
The Assassination of Archduke Franz Ferdinand of Austria triggered the start of the Great War (World War I)
the great depression triggered WWI
Germany's invasion of Poland.
Archduke Franz Ferdinand
great depression civil rights movement cold war vietnam war
North Korea's invasion into South Korea triggered the war.
What event triggered the great depression
Thecollapsed of the Soviet Union triggered the Cold War
Somme and Verdun.
Mexico's wish for Independence triggered by the Grito de Dolores.
after World War II
In many countries, including USA, Great Britain, and France.