Today is Monday, Feb. 20, the 51st day of 2017. There are 314 days left in the year. This is Presidents’ Day.

Today’s birthdays: Gloria Vanderbilt is 93. Actor Sidney Poitier is 90. Racing Hall of Famer Bobby Unser is 83. Jazz-soul singer Nancy Wilson is 80. Racing Hall of Famer Roger Penske is 80. Singer-songwriter Buffy Sainte-Marie is 76. Hockey Hall-of-Famer Phil Esposito is 75. Senate majority leader Mitch McConnell, Republican of Kentucky, is 75. Director Mike Leigh is 74. Actress Sandy Duncan is 71. Rock musician J. Geils is 71. Actor Peter Strauss is 70. Singer-guitarist Walter Becker is 67. Former British prime minister Gordon Brown is 66. Newspaper heiress Patricia Hearst is 63. Basketball Hall-of-Famer Charles Barkley is 54. Model Cindy Crawford is 51. Actress Lauren Ambrose is 39. Comedian Trevor Noah is 33. Singer Rihanna is 29.

In 1792, President George Washington signed an act creating the United States Post Office Department.

In 1907, President Theodore Roosevelt signed an immigration act which excluded ‘‘idiots, imbeciles, feeble-minded persons, epileptics, insane persons’’ from being admitted to the United States.

In 1962, astronaut John Glenn became the first American to orbit the Earth as he flew aboard Project Mercury’s Friendship 7 spacecraft.

In 2003, a fire sparked by pyrotechnics broke out during a concert by the group Great White at The Station nightclub in West Warwick, R.I., killing 100 people.

In 2007, in a victory for President George W. Bush, a divided federal appeals court ruled that Guantanamo Bay detainees could not use the US court system to challenge their indefinite imprisonment.

Last year, six people were shot to death in the Kalamazoo, Mich., area; an Uber driver is charged with murder in the apparently random attacks. Donald Trump barreled to victory in South Carolina’s Republican primary.