For a period of 24 hours after Freeze time ends and for the same period once you create a new account, your province is under Protection. During this time your province is unable to interact with other provinces, except to receive Aid. This period is used to prepare your province for exposure to the game world. Provinces under Protection are displayed on the Kingdom Page in green text, and with a trailing ^ after their province names.
Provinces joining a kingdom during war will be subject to a Freeze time which lasts 72 hours. You will start with less resources.