Your answer would be B. The Fort Laramie Treaty was negotiated.
Please correct if I'm wrong!! :) I'd be happy to fix it!!
In the Treaty of 1818, Britain and the United States agreed to joint control of the Oregon County for 10 years. During this Convention of 1818, Britain and united states of America also agreed to maintaining 49th parallel as the northern boundary of the Louisiana territory between the Lake of Woods and the Rocky mountains. <span />
Hitler made a law which isolated the Jews from the Germans and that the jews couldn't marry an Aryan.
There was also forced migration.