diff --git a/django/contrib/localflavor/us/us_states.py b/django/contrib/localflavor/us/us_states.py
index f1a3d73..0da47d5 100644
a
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b
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OBSOLETE_STATES = (
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152 | 152 | |
153 | 153 | |
154 | 154 | # All US states and territories plus DC and military mail. |
155 | | STATE_CHOICES = sorted(US_STATES + US_TERRITORIES + ARMED_FORCES_STATES, key=lambda obj: obj[1]) |
| 155 | STATE_CHOICES = tuple(sorted(US_STATES + US_TERRITORIES + ARMED_FORCES_STATES, key=lambda obj: obj[1])) |
156 | 156 | |
157 | 157 | # All US Postal Service locations. |
158 | | USPS_CHOICES = sorted(US_STATES + US_TERRITORIES + ARMED_FORCES_STATES + COFA_STATES, key=lambda obj: obj[1]) |
| 158 | USPS_CHOICES = tuple(sorted(US_STATES + US_TERRITORIES + ARMED_FORCES_STATES + COFA_STATES, key=lambda obj: obj[1])) |
159 | 159 | |
160 | 160 | STATES_NORMALIZED = { |
161 | 161 | 'ak': 'AK', |