Former British prime minister Tony Blair won the leadership election for the British Labour Party.
Source
US President Joe Biden withdrew from his re-election campaign and endorsed Kamala Harris as his preferred successor.
The world's fastest train, a maglev bullet train with speeds of 373 mph (600 km/h), debuted in China.
NASA's space shuttle program finally came to a close when mission STS-135 landed.
The Battle of Bull Run took place at Manassas Junction, Virginia.
Marvel's superhero movie 'Guardians of the Galaxy' premiered in Hollywood, Los Angeles, US.