Answer:
The three powers that states and people have that the Congress does not are:
The power of direct democracy: This refers to the ability of citizens to vote directly on laws and policies, rather than having them decided by elected representatives. This is a power that states and people have through initiatives, referendums and recall elections, which allow citizens to vote on laws and policies directly, rather than relying on the Congress to make decisions on their behalf.
The power of nullification: This refers to the ability of states to reject or nullify federal laws that they deem to be unconstitutional. This power is based on the principle of state sovereignty, which holds that states retain certain powers and rights that cannot be superseded by the federal government.
The power of constitutional amendment: This refers to the ability of citizens to propose and ratify changes to the Constitution through the process of constitutional amendment. This is a power that states and people have through the process of constitutional convention, which allows citizens to propose and ratify changes to the Constitution directly, rather than relying on Congress to initiate the process.
It is important to note that while states and people have these powers, they are not without limits and are subject to the principles of federalism and the Supremacy Clause of the US Constitution.