some new features

.venv/lib/python3.12/site-packages/holidays/countries/guam.py

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+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+
+from holidays.countries.united_states import UnitedStates
+from holidays.mixins.child_entity import ChildEntity
+
+
+class HolidaysGU(ChildEntity, UnitedStates):
+    """Guam holidays.
+
+    Alias of a US subdivision that is also officially assigned its own country code in ISO 3166-1.
+    See <https://en.wikipedia.org/wiki/ISO_3166-2:US#Subdivisions_included_in_ISO_3166-1>
+    """
+
+    country = "GU"
+    parent_entity = UnitedStates
+    # Became a U.S. Territory on April 11th, 1899.
+    start_year = 1900
+
+
+class Guam(HolidaysGU):
+    pass
+
+
+class GU(HolidaysGU):
+    pass
+
+
+class GUM(HolidaysGU):
+    pass