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The development of devastating new weapons technologies.
the increased availability of credit.
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 sinking of the Lusitania pushed the United States into the war.
Some timely battlefield victories, to compensate for the terrible casualties coming out of Grant's endless Siege of Petersburg. Sheridan in the Shenandoah, Sherman in Atlanta, and Farragut in Mobile.
The development of devastating new weapons technologies.
The number of combatants was the deciding factor: 78,700 American soldiers vs. 25-40,000 Mexican defenders.
Labor
the Nile
High prices for supplies contributed to the creation of the farmers alliance.
High prices for supplies contributed to the creation of the farmers alliance.
Drought was the main factor that contributed to the famine in Africa. Failed government policies were another factor that contributed to widespread famine.
Hot weather.
General Grant's operations in Virginia in 1864 created important elements based on his decisions to mount frontal assaults against the entrenched forces of the Confederates. Grant was highly criticized for the number of Union casualties as he persisted to take the offensive far too many times against the "dug in" forces of General Lee. Even when Lee resisted Grant's advances, Lee's smaller army suffered proportionately as many casualties as the Union forces. Confederate counter attacks, necessary to avoid defeat contributed to Lee's losses. In the end however, Northern protests at the number of Union casualties forced Grant to abandon the offensive and settle in for a very long siege.
One thing that was not a major factor in the decision to use the atomic bomb was civilian casualties.
One thing that was not a major factor in the decision to use the atomic bomb was civilian casualties.
It's location