southern blacks to northern cities
Before the War of the Currents, Nikola Tesla worked for Thomas Edison at the Edison Machine Works in the 1880s. Initially, Tesla admired Edison and sought to improve Edison's direct current (DC) electrical systems. However, tensions arose due to disagreements over electrical engineering principles and Edison's refusal to support Tesla's ideas for alternating current (AC) technology, leading to Tesla's departure and the eventual rivalry that defined the War of the Currents.
While Thomas Edison promoted direct current (DC) for electrical power distribution, George Westinghouse advocated for alternating current (AC) systems. AC could be transmitted over long distances more efficiently and at higher voltages than DC, making it a more practical choice for widespread electricity distribution. This rivalry culminated in the "War of the Currents," where AC ultimately became the dominant system for electrical power due to its advantages in scalability and cost-effectiveness. Westinghouse's AC system was eventually adopted for major projects, including the electrification of the 1893 World's Columbian Exposition in Chicago.
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.
the great depression triggered WWI
The Assassination of Archduke Franz Ferdinand of Austria triggered the start of the Great War (World War I)
Archduke Franz Ferdinand
Germany's invasion of Poland.
great depression civil rights movement cold war vietnam war
What event triggered the great depression
North Korea's invasion into South Korea triggered the war.
Somme and Verdun.
Thecollapsed of the Soviet Union triggered the Cold War
Mexico's wish for Independence triggered by the Grito de Dolores.
after World War II
WWI was a major cause of the Great Depression.