Merge branch 'jusce17-us_juneteenth_holiday' into beta

CHANGES

@@ -7,7 +7,7 @@ Released ????, ????
 - Support for Botswana #477 (pietervdw115)
 - Poland fix #464 (m-ganko)
 - Singapore updates for 2022 #456 (mborsetti)
-- US updates #474 (ChristianAlexander)
+- US updates #474, #488 (ChristianAlexander, jusce17)
 - NG updates #486 (pietervdw115)
 - UK updates #487 (orrock, dr-p)
 - .gitignore fix #462 (TheLastProject)

holidays/countries/united_states.py

@@ -361,6 +361,10 @@ def _populate(self, year):
         elif year >= 1888:
             self[date(year, MAY, 30)] = "Memorial Day"
 
+        # Juneteenth Day
+        if year > 2020:
+            self[date(year, JUN, 19)] = "Juneteenth National Independence Day"
+
         # Jefferson Davis Birthday
         name = "Jefferson Davis Birthday"
         if self.state == "AL" and year >= 1890:

test/countries/test_united_states.py

@@ -36,6 +36,13 @@ def test_new_years(self):
             self.assertNotIn(dt + relativedelta(days=-1), self.holidays)
             self.assertNotIn(dt + relativedelta(days=+1), self.holidays)
 
+    def test_Juneteenth_day(self):
+
+        for year in range(2010, 2020):
+            self.assertNotIn(date(year, 6, 19), self.holidays)
+        for year in range(2021, 2030):
+            self.assertIn(date(year, 6, 19), self.holidays)
+
     def test_epiphany(self):
         pr_holidays = holidays.US(state="PR")
         for year in range(2010, 2021):