历史上的今天 · 11月21日
1620
「五月花号公约」在锚泊的船上签署，成为普利茅斯殖民地的第一份自治文件
The Mayflower Compact, the first governing document of Plymouth Colony, is signed aboard ship.
1877
爱迪生宣布发明留声机：一台既能录音又能放音的机器
Thomas Edison announces his invention of the phonograph, a machine that records and plays back sound.
1922
丽贝卡·费尔顿成为美国历史上第一位联邦参议员，尽管只任职一天
Rebecca Latimer Felton becomes the first woman to serve in the United States Senate, for a single day.
1964
纽约韦拉扎诺海峡大桥通车，当时是世界上最长的悬索桥
New York's Verrazzano-Narrows Bridge opens, then the longest suspension bridge in the world.
2009
黑龙江龙煤集团一座煤矿发生瓦斯爆炸，108名矿工遇难
An explosion at a coal mine in Heilongjiang, China, kills 108 miners.
资料来源：维基百科「历史上的今天」（CC BY-SA），GSM 整理 · Source: Wikipedia "On this day" (CC BY-SA), curated by GSM