The production of in the south caused Americans to need more land to farm resulting in Americans moving west into Native American lands.

Cotton

Explanation:

At that time, cotton was considered as cash crops. Is the type of agricultural crop that generate high amount of income with very little investment /efforts. Many southern plantations sold the cottons to Other manufacturers in Europe since they need it as materials for textiles, outdoor equipment's, and beds.

This made a lot of plantation owners in the South had a need to obtain lands in order to open up new factories. A lot of lands near them at that time owned by Native Americans. So, the government forcefully removed the natives from the ancestral land and move them to reservation.

Originally Mao Zedong position about China's population growth was optimistic as he mentioned that "Even if China's population multiplies many times, she is fully capable of finding a solution; the solution is production.", The slogan “Late, Long, and Few” represented a change in his position as this was part of a campaign to reduce the number of births in China. This campaign proved to be effective because from 1970 to 1976 the births per women in China were reduced from six to three.