The nationwide extension of railroads.
Extensive Immigration of skilled workers from Europe.
It was an age of important inventions - electric light, telephone, bicycles, automobiles, refrigerated shipping.
Medical advances - better survival-rates for workers.
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the railroadnetwork
The home-ground factor - fighting on terrain unfamiliar to the enemy, and the emotive mission of defending the homeland against the invader.
push factor
In Japan the greatest cause of casualties was the atomic bombs and the napalm bombs (which did more damage and killed more people than the A bombs). In Germany and Europe the aerial bombing and the invasion of Europe by the Allied Forces use of Tanks and automatic machine guns caused the most casualties. In the Pacific the total combined use of planes, ships and infantry with all their weapons caused the most casualties on both sides. Torpedo use was another factor in the Pacific for many ship deaths. Another factor to consider is that casualties from the battles did not kill as many people as disease, exposure to the elements/climates, starvation, suicide and genocide, murders and mistreatment of the POWs did. In fact, the worldwide influenza killed more people worldwide than battle injuries.
The tide