The correct answer is: German troops invaded France through Belgium on August 4th, 1914, as part of the Schlieffen Plan.
Not only had Britain promised to defend Belgium under the Treaty of London of 1839, moreover German control of Belgium would have been seen as a serious threat to Britain.
The factor that most directly resulted in Great Britain’s entering world war 1 was to defend Belgium and react against Germany’s violation of the 1839 treaty.
Explanation
German went to war with Belgium making Britain to be involved in the world war 1 because the 1839 Treaty of London that was signed by Prussia (which Germany was a successor state) required that the neutral state of Belgium should be respected by all members in the treaty. Britain involvement in the war reminded Germany of their obligations concern that treaty.
The North wanted the new states to be “free states.” Most northerners thought that slavery was wrong and many northern states had outlawed slavery. The South, however, wanted the new states to be “slave states.” They didn't want to give up their way of life
The purpose of Sherman's March to the Sea was to frighten Georgia's civilian population into abandoning the Confederate cause. Sherman's soldiers did not destroy any of the towns in their path, but they stole food and livestock and burned the houses and barns of people who tried to fight back.
