What did article 10 of the treaty of versailles include ?
a. a collective security provision
b. a plan for rebuilding germany
c. an opt-out cause for russia
d. a reduction in international trade tariffs

Article 10 of the Versailles Treaty. The most controversial of the League of Nations covenants, Article 10 said that all nations must protect the territorial and political integrity of other League members. The article meant that if one nation was engaged in war, all others must become involved

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.