1) The American Civil Rights Movement, led by figures like Martin Luther King Jr., fought for equal rights and helped bring about significant social and legislative changes.

2) Cricket, originating in England, is a popular sport played in many countries and is known for its distinctive rules and terminology.

3) The first commercially successful video game was "Pong," released in 1972 by Atari.

4) The development of the microprocessor by Intel in 1971 paved the way for the modern computer and led to the exponential growth of computing power.