The answer is B periodization
It is d because of the more immigrants
When the Continental Congress wrote the Articles of Confederation, they did not want to enforce taxes on the new states because they did not want to be like Britain. The Articles of Confederation granted the states the right to tax if they wanted to, however it was not a federal law that the federal government tax the states. Given the fact that the states could choose if they wanted to tax or not, it is not surprising that they chose not to tax, causing the United States to go further into debt. This is also one of the main reasons why the Articles of Confederation failed. The debt led them to over print money which led to inflation and also the fact that there was no national currency (each state could make their own money) really helped.
This policy created by John Hay was known as the Open Door Policy.
The goal of this policy would be to allow European countries and America to trade with China on an equal basis. John Hay wanted to ensure that no one country had a monopoly on the trade with China during the early 20th century. Along with this, he felt that the Open Door policy would result in less fights/confrontation between the countries involved in this trade.