On March 30, 1775, King George III formally endorsed the New England Restraining Act, requiring New England colonies to trade exclusively with Great Britain and banning colonists from fishing in the North Atlantic.
On March 30, 1870, the 15th Amendment, granting African-American men the right to vote, was formally adopted into the U.S. Constitution. One day later, the first African-American male voted in New Jersey.
On March 30, 1867, U.S. Secretary of State William Seward signed a treaty with Russia purchasing Alaska for $7 million. Despite the price of approximately two cents an acre, the purchase was ridiculed in the press as “Seward’s folly.”