Good Friday seems to be listed twice.

Ran this in powershell
$h = Invoke-RestMethod ‘https://public-holiday.p.rapidapi.com/2019/US’ -Method ‘GET’ -Headers $headers$h | Select localName, date

Got this as a result:
localName date

New Year’s Day 2019-01-01
Martin Luther King, Jr. Day 2019-01-21
Presidents Day 2019-02-18
Good Friday 2019-04-19
Good Friday 2019-04-19
Memorial Day 2019-05-27
Independence Day 2019-07-04
Labor Day 2019-09-02
Columbus Day 2019-10-14
Veterans Day 2019-11-11
Thanksgiving Day 2019-11-28
Christmas Day 2019-12-25