Truman didn't tell Stalin that the United States had developed the atomic bomb.
The British government relaxed rules regulating trade for the American colonies in the late 1600s because the British hoped the colonies would become wealthier and spend more on manufactured goods from Britain.
The Tenth Amendment upholds both federalism and the state's rights. It identifies the rights of the people (state rights) not only of government power to the people. The bill of rights is implemented in the US, which means it extends to all the states. The US Constitution applies the law to all its jurisdiction which is all the states.
