When Silicon Valley Bank imploded last week, it was the second biggest bank failure in U.S. history. Then, over the weekend, another bank, Signature Bank, was also taken over by the government. WSJ financial editor Charles Forelle explains what kicked off this banking crisis and how the government is scrambling to contain it. Further Reading: - How Silicon Valley Turned on Silicon Valley Bank  - Silicon Valley Bank Closed by Regulators, FDIC Takes Control  - Were SVB and Signature Bank Just Bailed Out by the U.S. Government?  Learn more about your ad choices. Visit megaphone.fm/adchoices