United States President Donald Trump hailed America on its 250th birthday on Saturday as the “crowning achievement” of human history, even as he used the event to renew his attack on domestic opponents he branded communists. In a speech delayed by several hours when storms forced the temporary evacuation of crowds in Washington, Trump claimed that under his presidency the United States was “prouder than ever before”. While Trump had promised a huge political rally to stamp his brand on the national celebrations, the 80-year-old Republican largely stuck to a more traditionally patriotic script.