在1790年美国第一次人口普查时，全国人口中有一半为16岁或更小。

At the time of the first United States census in 1790, half of the people in the country were 16 or younger.

youdao

在1790年美国第一次人口普查时，全国人口中有一半为16岁或更小。

At the time of the first United States census in 1790, half of the people in the country were 16 or younger.

youdao