Hoping to keep the New England colonies dependent on the British, King George III formally endorses the New England Restraining Act on March 30, 1775. The New England Restraining Act required New England colonies to trade exclusively with Great Britain as of July 1. An additional rule would come into effect on July 20, banning colonists from fishing in the North Atlantic.

In territorial Kansas’ first election, some 5,000 so-called “Border Ruffians” invade the territory from western Missouri and force the election of a pro-slavery legislature. Although the number of votes cast exceeded the number of eligible voters in the territory, Kansas Governor Andrew Reeder reluctantly approved the election to prevent further bloodshed.

Following its ratification by the requisite three-fourths of the states, the 15th Amendment, granting African American men the right to vote, is formally adopted into the U.S. Constitution.

Henry Wallace, former vice president and Progressive Party presidential candidate, lashes out at the Cold War policies of President Harry S. Truman. Wallace and his supporters were among the few Americans who actively voiced criticisms of America’s Cold War mindset during the late-1940s and 1950s.

A bomb explodes in a car parked in front of the U.S. Embassy in Saigon, virtually destroying the building and killing 19 Vietnamese, two Americans, and one Filipino; 183 others were injured. Congress quickly appropriated $1 million to reconstruct the embassy. Although some U.S. military leaders advocated special retaliatory raids on North Vietnam, President Lyndon B. Johnson refused.

On March 30, 1974, the Ramones play their first New York City gig, launching a punk-rock revolution.

John Denver scores his first #1 song, “Sunshine On My Shoulders,” on March 30, 1974. He would go on to become one of the most popular singer-songwriters of the 1970s.

On March 30, 2009, President Barack Obama issues an ultimatum to struggling American automakers General Motors (GM) and Chrysler: In order to receive additional bailout loans from the government, he says, the companies need to make dramatic changes in the way they run their businesses. The president also announced a set of initiatives intended to assist the struggling U.S. auto industry and boost consumer confidence, including government backing of GM and Chrysler warranties, even if both automakers went out of business.