results_list = ["WA", "OR", "CA", "WA", "WA", "OR", "WA"]

# Remove duplicates by iterating through the original list
# and adding anything not yet in the new list to the new list.
new_list = []
for res in results_list:
    if res not in new_list:
        new_list.append(res)
print(new_list)

# Or do the same thing with a set, which removes duplicates
results_set = set(results_list)  # Create a set our of a list
print(results_set)
new_results_list = list(results_set)
print(new_results_list)