US President Barack Obama received a vaccine jab against the swine flu.
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Transgender people were no longer allowed to use public toilets after Obama's rule was rebuked by Donald Trump.
The 'Don't Ask Don't Tell' policy was repealed.
Barack Obama became the first African American to win a United States Presidential Election.
The FBI's most wanted man, Osama bin Laden, was killed by the US Navy Seals and CIA operatives in Abbottabad, Pakistan.
President Barack Obama announced his Clean Power Plan to take action on climate change.
