According to a recent poll, owning and living in a freestanding house on its own land is still a goal of a majority of young adults, as it was (goal) of earlier generations.
its own land, 这里its指的是house. 美国的房子有多种形式: single family house, apartment(condo), townhouse, etc. 其中single family house是独立的房子,有its own land. 其他形式的房子则没有own land, 而是和其他屋主一起分享land.