Diplomatic action
Following unrest in Essos, many Essosi families migrate or flee to Westeros, proceeding to buy up land and settle -- Some even being granted noble titles under Westerosi law.
Full proposal here: By Waffle Dorne: House Hotah of Sandyshore Crownlands: House Rogare of the Whispers Vale: House Staegone of Stonyhead Riverlands: House Iryns of Misty Isle Stormlands: House Maegyr of Morne