What caused historians to think that the eruption of Mount Vesuvius in 79 CE was not the only reason why the residents of Pompeii died?

Until now it's been widely assumed that most of the victims were asphyxiated by volcanic ash and gas. But a recent study says most died instantly of extreme heat, with many casualties shocked into a sort of instant rigor mortis.

Explanation:

the labor movement in the united states grew out of the need to protect the common interest of workers

for those in the industrial sector organized labor unions fought for better wages reasonable hours and safer working conditions

  in the 19th century trade unionism was mainly a movement of skilled workers.

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united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).