For the Constitution to take effect, nine states required to ratify it, according to Article VII. The state conventions served other purposes in addition to the legal requirements for ratification. During the Philadelphia convention, the Constitution was drafted in complete secrecy.
Answer: I think they never said they could... but I don't know history-
Explanation: The Open Door policy was a statement of principles initiated by the United States in 1899 and 1900. It called for protection of equal privileges for all countries trading with China and for the support of Chinese territorial and administrative integrity. The main reason the United States announced the Open Door Policy is to ensure that U.S. businesses could operate in China. The backlash against foreigners led to widespread killings of missionaries working in China and an increase in nationalist feelings among the Chinese. The Boxer Rebellion was one of the most important events caused by this anti-foreign movement.
By eliminating competition, trusts could charge whatever price they choose
The middle east is the answer
Federalism helped to solve the problems between the state and federal government by creating a system in which these two different governments shared power in a somewhat equal manner.
Under the Articles of Confederation, the state governments had significantly more power than the federal government. The lack of power by the federal government resulted in disunity in America. This is why the US Constitution included more power for the federal government. However, the state governments would still have significant power thanks to the addition of the 10th amendment. The constitution helped to create a good balance between the two types of government.