Or here's a video that I made as part of my show "Crash Course," talking about World War I: 还有这个视频，是我的节目《速成班》中的一期，讲的是第一次世界大战： The immediate cause was of course the assassination in Sarajevo of the Aus
December 1, 2007 THE PRESIDENT: Good morning. Next week, Congress returns from its Thanksgiving recess. Members are coming back to a lot of unfinished business. And the clock will be ticking, because
REMARKS BY PRESIDENT OBAMAAND RUSSIAN PRESIDENT MEDVEDEVAFTER MEETING Winfield HouseLondon, United Kingdom1:01 P.M. (Local) PRESIDENT OBAMA: Let me just make a brief comment. I am very grateful to Pre
Good morning! Thank you all very much for joining me this morning after a long night – and a long few months – for all of us. Yesterday, Scotland – like London and Northern Ireland – voted overwhelmin
PRESIDENT OBAMA: Good morning, everybody. It is my privilege to welcome you to Washington and to formally convene our fourth Nuclear Security Summit. I convened our first summit – six years ago, in th
