How to display that forms?

I'm thinking how to display forms in that configuration:

I have 3 simple models:

class Province(models.Model):

    name = models.CharField(max_length=30)

    slug = models.SlugField(max_length=30, unique=True)

class UserProvince(models.Model):

    user = models.ForeignKey(User)

    province = models.ForeignKey(Province)

class UserCity(models.Model):

    user = models.ForeignKey(User)

    province = models.ForeignKey(Province)

    city = models.CharField(max_length=10)

    slug = models.SlugField(max_length=100, editable=False)

now, each user can have several provinces added. then, he can add several cities to his each added province.

province1

    city1

    city2

    city3

province2

    city4

    city5

    city6

province3

    city7

    city8

    city9

I want to display all his provinces and under each of it, I want to display form with input to add city to it. What is the best way to do this? There's going to be unknown number of provinces.

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