It was a chain reaction. Long story short, the countries were pulled into the war because of agreements they had with their allies. This treaty is what caused the countries to enter WWI, to protect and defend their allied countries who were already in the war.
Small states, because each state would have equal representation in the senate (2 senator per state), unlike large states, who would have dominated if representation in the senate was based on population
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What happened in 1970 Major News Stories include Concorde first supersonic flight, Jumbo Jet goes into service, Isle of Wight Festival, Chicago Seven found guilty, Aswan High Dam completed, US and the UK lowers the voting age to 18, 100,000 demonstrate in Washington DC against the Vietnam War, First Earth Day, Beatles disband.