US Congress released a US flag that featured 20 stars and 13 red and white stripes.
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The 21st Commonwealth Games officially began on the Gold Coast, Queensland, Australia.
Finland officially joined NATO, becoming the 31st member of the security alliance.
Jack Ma founded Alibaba Group Holding Limited.
Beyoncé and Jay-Z married with only 40 guests present on their special day.
New York City's Twin Tower World Trade Center was officially opened.
