Manchuria is the leading industrial center because

The Manchuria most parts of China provides us, being one of the most Chinese regions where heavy industries are concentrated due to the presence of the largest reserves of coal, as the steel industry is concentrated too in Manchuria

Manchuria was a leading industrial center because it was part of a major Silk Route to the world.

Silk Road in Sumur,India,Asia was a trade route to many countries like China,Southern Manchuria,and Japan.

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.