The US Supreme Court has ruled that Section 3 of the Defense of Marriage Act ("DOMA") violates the equal protection clause and is unconstitutional. The Court has not yet ruled on whether Section 2 of DOMA violates the full-faith-and-credit clause.
passing ex post facto laws
expand the breif provisions of the constitution
Congress effects changes to the Constitution by proposing amendments that would have to be ratified by 3/4 of state legislatures or state conventions called for the purpose of ratification. Congress cannot make any Constitutional changes on its own.
By passing laws that clarify how the government works.
Congress doesn't clarify the constitution. They make laws. It is the Supreme Court that uses the constitution to interpret laws. There are judges who believe in strict interpretation of the constitution and they try to follow the constitution written as the founding fathers meant it to be made. Then, there are those who believe that there should be a looser interpretation because 200 years ago there was a different world than today.
Congress had trouble passing the constitution because they needed a vote from the 9 of the 13 states.
Why do you think the constitution forbids congress from passing ex post facto laws
No. Article I, Section 9, paragraph 3 of the Constitution prohibits Congress from passing ex post facto laws.
first session of Congress: 1789 most important task: passing Bill of Rights (which gave all American citizens rights)
the congress reacted to the kkk's terror by passing the radical reconstrustion
States are admitted to the union through a process outlined in the U.S. Constitution. This process involves Congress passing a law to admit a new state, which typically includes the approval of the state's constitution and boundaries.
Since the Constitution places the power and responsibility for passage of legislation with the Congress, passing a law is more an example of the basic function of the legislative branch than an example of checks and balances. However, it could become an example of checks and balances if Congress passes a law, the President vetoes it, and Congress then overrides the President's veto as provided in the Constitution.