UK Important Events By heralgab Jan 1, 1914 Outbreak of World War I UK enters hostilities against Germany. Jan 1, 1929 World Stock Market Crash unemployment rates begin to rise in the UK Jan 1, 1939 World War II Germany invades poland; UK declares war on Germany Apr 14, 1940 Winston Churchill becomes prime minister Jan 1, 1945 UK becomes a permanent member of the UN Security Council Apr 14, 1973 UK joins the European Economic Community Sep 11, 2001 after 9/11 attacks in the US, PM Tony Blair offers strong support for US-led campaign against international terrorism Sep 7, 2003 UK joins US army campaign against Iraq Apr 29, 2011 Prince William and Kate Middleton get married Jan 1, 2012 the UK economy shrinks by .02% between January and April