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Great Compromise

Also known as the Connecticut Compromise, a major compromise at the Constitutional Convention that created a two-house legislature, with the Senate having equal representation for all states and the House of Representatives having representation proportional to state populations.

Explanation:

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.