The first wagon train arrived in California after having left Independence, Missouri, in May 1841.
Source
J.K. Rowling's first Harry Potter Movie, 'The Philosopher's Stone,' premiered in Leicester Square, London, UK.
The Paris Climate Change Agreement went into force.
Barack Obama became the first African American to win a United States Presidential Election.
Mozart's Symphony No.36 premiered in Linz, Austria.
A plane crash in South Sudan at Juba International Airport killed 31 people.
