Europe's economy slowed sharply, a U.S.-China trade war loomed, fears of a real war with North Korea grew, while U.S. politics sank deeper into chaos, and a gunman massacred at least 49 innocents attending services at a Christchurch, New Zealand mosque, even as they prayed. It was a week of crises.

Since 1957, the internal rate of return on American stocks has been 6.9%, and there were plenty of crises all along the way.

The Standard & Poor's 500 stock index closed at 2,822.48 on Friday, up sharply from 2,743.07 a week ago, and rebounding the close of 2,803.69 two weeks ago.