"Matthew Williams' masterful analysis, which straddles history, law and political science, causes us to rethink key theories of the judicialization of politics. His work is a tour de force that will be appreciated not only for its combination of computational text analysis and process tracing histories, but also for its expansive ambition, covering seven decades and five jurisdictions." - Petra Schleiter, Professor of Comparative Politics, University of Oxford, United Kingdom "We live in an age of data and data analytics. Analysing huge swathes of legislative text across time and jurisdictions, Matthew Williams has revealed a series of fascinating changes in language use. This clearly written book with its compelling narrative is an important contribution to our understanding of law and policy in the 21st century." - Sir Nigel Shadbolt, Professor of Computer Science, University of Oxford, United Kingdom By machine reading 60,556,672 words of legislation, and analysing 7,469 country years, this book uncovers changing patterns in the language of laws. In addition to this wide angle, a tight focus on five countries - Canada, France, Germany, the UK and the US - reveals the effects of changing legal language on policy power for judges. With this new perspective and new data, the book explains how and why judges have become more actively involved in public policy disputes on such sensitive topics as abortion, human rights and terrorism. Matthew Williams is Tutor and Fellow of Jesus College, University of Oxford, UK. He lectures on British and comparative politics. His research analyses the language of politics, how the language of legislation has changed over the past century, and the effects of these changes on litigation strategies and public administration.