Which historical development is most closely associated with this poster

the Cultural Revolution

Explanation:

Cultural Revolution was the movement that urged on preserving communism and the Communist party in China with the leader Mao Zedong on the top. It wanted to change the capitalistic and traditional elements of Chinese ideas and life into the ones that are always connected with Mao’s character and thought. This was titled Maoism.  

The propaganda posters of the kind depicted above were common during the period. They were glorifying Mao and his influence on the people, soldiers, and culture of the country. While we cannot understand the text if we do not know Chinese, it is evident the poster is putting the image of Mao in line with the rising sun, trying to highlight his importance as the force that gives life to China and its people.

the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.